alcatel-lucent.testking.4a0-103.v2015-03-12.by.bradley...alcatel-lucent multi protocol label...

Testking.4A0-103,249.QA

Number: 4A0-103Passing Score: 800Time Limit: 120 minFile Version: 6.0

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4A0-103

Alcatel-Lucent Multi Protocol Label Switching

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Exam A

QUESTION 1Which of the following reservation styles can be used to prevent both the primary and secondary paths from booking resources on a common link?

A. Fixed filterB. Shared explicitC. Standby explicit LSPD. Preemptive filterE. Link capacity filter

Correct Answer: BSection: (none)Explanation

Explanation/Reference:answer is valid.

QUESTION 2Which of the following statements regarding RSVP-TE is FALSE?

A. RSVP-TE operates in a downstream unsolicited label advertisement mode.B. RSVP-TE makes use of ordered control mode.C. RSVP-TE is an MPLS signaling protocol, based on the resource reservation protocol.D. RSVP-TE enables the establishment of explicitly routed LSPs that can be automatically routed away from network failuresE. RSVP-TE supports explicitly routed LSPs using either loose or strict route definitions.

Correct Answer: ASection: (none)Explanation

Explanation/Reference:

QUESTION 3Click on the exhibit button below:

Consider the following:- Router R2 is an ABR in OSPF Areas 0 and 1.- Router R2 advertises the aggregate prefix 10.10.10.0/24 into Area 1.

- Router R1 in Area 0 generates LDP labels for FECs 10.10.102/31 and 10.10.10.4/31 Router R3 in Area 1 places these FECs in its LIB, but it does not place themin its LFIB. What can you do on router R3 to make it populate these labels in its LFIB?

A. Disable route summarization on router R3B. Enable LDP aggregate prefix matchC. Create an import policy to accept these FECsD. Disable LDP exact match on the specified FECs



QUESTION 4An LSP path is configured as follows:- Shared-explicit reservation style- Make-before-break (MBB) enabled- 500Mpbs bandwidth reserved on a 1Gbps link

With 100Mbps of unreserved bandwidth remaining, the operator increases the LSP-path's bandwidth reservation to 900Mbps. What happens to the existing LSP?


A. CSPF looks for the delta bandwidth, taking down the first path if necessary.B. CSPF looks for the delta bandwidth, implementing make-before-break.C. After 5 failed attempts to find the bandwidth requested, the head end disables the LSP.D. CSPF looks for the entire bandwidth requested, implementing MBB.



QUESTION 5Which approach to LSP path diversity provides the most control, but the least flexibility?

A. Administrative GroupsB. Shared Risk Link GroupsC. Strict hop LSP pathsD. Fast reroute

Correct Answer: CSection: (none)Explanation


QUESTION 6If an Alcatel-Lucent 7750 LSR receives a labeled packet with a outer label TTL of 250 and an inner label TTL of 251, which of the following statements is true?

A. The packet will be label switched; the outer label TTL will be 249 and the inner label TTL will be 250.B. The packet will be label switched; the outer label TTL will be 249 and the inner label TTL will be 251.C. The packet will be label switched; both the outer label TTL and the inner label TTL will be 250.D. The packet will be label switched; both the outer label TTL and the inner label TTL will be 249, because they must be the same.



QUESTION 7Which of the following statements best defines an LSP?

A. An LSP is a bidirectional path across the MPLS domain.B. An LSP is a bidirectional path for a particular FEC across the MPLS domain.C. An LSP is a unidirectional path across the MPLS domain.D. An LSP is a bidirectional path between adjacent LSRs.E. An LSP is a unidirectional path between adjacent LSRs.



QUESTION 8Click on the exhibit button below.

Given the following fast reroute protected LSPs:-LSP1.R1-R4-R5-R3-LSP2.R1-R4-R5-R2

Which routers become bypass tunnel PLRs? Choose two answers

A. Router R1B. Router R2C. Router R3D. Router R4E. Router R5

Correct Answer: AESection: (none)Explanation


QUESTION 9You wish to build an LSP originating on router R1, transiting the path R1-R2-R4-R5-R6, and terminating on router R6. How many strict hops would you define inyour path statement?

A. 4B. 1C. 5D. 6



QUESTION 10Which of the following statements regarding the last two octets of the LDP identifier is true?

A. It is always a random 16-bit number.B. It is always zero for per-interface label space.C. It is always non-zero.D. It is always zero for per-platform label space.E. It is always non-zero for per-platform label space.

Correct Answer: DSection: (none)Explanation


QUESTION 11Which of the following prerequisites must you configure on a router to enable LDP-over-RSVP support? (Choose two)

A. Configure the T-LDP peers for tunneling.B. Configure tunneled T-LDP sessions between PE routers.C. Enable Idp-over-rsvp in the IGP configuration on the PEs and ABRsD. Enable LSP stitching on the RSVP LSPs

Correct Answer: ACSection: (none)Explanation


QUESTION 12Which of the following statements regarding RSVP path messages on an Alcatel-Lucent SR is true?

A. The path message's IP header options field sets the router alert option.B. The IP header source address is the sender's egress interface address.C. The IP header destination address is the next-hop interface address.D. The IP header HOP object reflects the upstream router's egress interface address.



QUESTION 13What is the function of the MPLS label assigned to a packet?

A. It identifies the FEC.B. It specifies the packet's header lengthC. It identifies the origin of the packet.D. It specifies the type of data contained in the packet



QUESTION 14Which of the following statements regarding DiffServ-TE LSPs is true?

A. The Maximum Allocation Model (MAM) provides the most efficient bandwidth utilization modelB. In the Maximum Allocation Model (MAM), each CT receives dedicated bandwidth constraints.C. In the Russian Doll Model (RDM), a CT2 LSP automatically preempts a CT1 LSP.D. Using the Russian Doll Mode! (RDM), a CT1 LSP may use unreserved CTO bandwidth.



QUESTION 15Which of the following routing protocols are supported on the Alcatel-Lucent 7750 SR to enable constraint-based LSPs? (Choose two)

A. RIPv2-TEB. CSPFC. OSPF-TED. ISIS-TEE. RSVP-TE

Correct Answer: CDSection: (none)Explanation


QUESTION 16Which of the following statements is true when the implicit null is implemented?

A. The penultimate router will POP the top label from the packets.B. The eLER will receive packets with a top label value of 3.C. The eLER will receive packets with a top label value of 0.D. The penultimate router will always receive unlabeled packets.E. The penultimate router performs a double lookup on the packet.



QUESTION 17Which of the following is described by the following statement? An LSR propagates a label mapping only for a FEC for which it has a label mapping for the FECnext-hop.

A. Independent control modeB. Ordered control modeC. Liberal label retentionD. Conservative label retentionE. Downstream on demand.



QUESTION 18Which of the following commands is used to display the database containing the OSPF-TE LSAs?

A. show router ospf opaque-databaseB. show router ospf databaseC. show router ospf opaque-IsaD. show router ospf te opaque



QUESTION 19Which of the following statements regarding LSPs are true? (Choose two)

A. IGP-based LSPs are established solely from information contained in routing tables.B. The constraint-based routed LSP is calculated at the ingress of the network, based on the router database and user defined constraints.C. The constraint-based routed LSP is calculated at each hop of the LSP, based on the route table and user defined constraints.

D. IGP-based LSPs must use LDP signaling.

Correct Answer: ABSection: (none)Explanation


QUESTION 20Which of the following statements regarding LDP-over-RSVP are true? (Choose two)

A. Targeted sessions must exist between all routers in the tunnel's path.B. Each LDP interface must be configured to support LDP tunneling.C. LDP prefixes resolve to an RSVP LSP, rather than to a physical egress interface.D. RSVP LSPs must exist between each PE-ABR pair, or ABR-ABR pair in each area.

Correct Answer: CDSection: (none)Explanation

Explanation/Reference:answer is corrected and modified.


Given the configuration shown, how much of a link's 100Mbps reservable bandwidth can an LSP access when configured for class-type 0 and priority 1?

A. 10MbpsB. 20MbpsC. 30MpbsD. 60MbpsE. 70Mbps

Correct Answer: ESection: (none)Explanation


QUESTION 22Which of the following statements is true of an established LDP session?

A. It uses a UDP connection with an arbitrary port number.B. It uses a UDP connection with well known port number 646.C. It uses a TCP connection with an arbitrary port number.D. It uses a TCP connection with well known port number 646.




Which fields in this output uniquely identify the RSVP session belonging to a single LSP? (Choose three)

A. Tunnel IDB. NameC. LSP IDD. To

Correct Answer: ABCSection: (none)Explanation


QUESTION 24How many bits of the MPLS header are used for the label field?

A. 16B. 20C. 24D. 25E. 32



QUESTION 25Which of the following best describes constraint-based routing?

A. A mechanism that implements opaque LSAs.B. A mechanism that computes routes based on defined user requirements.C. A mechanism that allows the IGP shortest path to be used.D. A mechanism that allows RSVP or LDP signaling to use a route other than the IGP best route to establish a LSP.

Correct Answer: BSection: (none)

Explanation


QUESTION 26A targeted-LDP session may exist between directly connected or non-directly connected devices

A. TRUEB. FALSE



QUESTION 27On a point-to-point link, two directly connected routers set different interface hello timeout values. Router R1 uses 15 seconds, while router R2 uses 30 seconds.What happens to the LDP adjacency?

A. The adjacency forms with the lower timeout valueB. The "show router Idp session" command output displays the adjacency in state "init"C. The adjacency forms with the higher timeout valueD. The adjacency times out after 30 seconds



QUESTION 28Router R4 originates 500 RSVP signaled LSPs with default hello and refresh timer settings If the only downstream communication fails (link is operationally UP),how long will RSVP wait before it declares the RSVP sessions down?

A. 3000ms

B. 9000msC. 30000msD. 120000ms




LSP "toR8-5" requests fast reroute protection on the primary loose path. What could be done to remove the Failure Code shown?

A. CSPF must be enabled at head-end on fast reroute protected loose path LSPsB. Fast reroute must first be enabled on the downstream routers.C. CSPF must be enabled on all downstream loose hop routers.D. Global revertive path optimization must be enabled so the path will be re-optimized around a failed node.




If the four LSPs shown use the shared-explicit reservation style, how much bandwidth does CSPF request across a single 1Gbps link?

A. 100MbpsB. 200Mbps

C. 300MpbsD. 600MbpsE. 700Mbps



QUESTION 31Which of the following statements regarding the MPLS SWAP label operation is true?

A. The inner label will be exchanged with the MPLS outer label.B. The inner label will be exchanged for a new label.C. The outer label will be exchanged for a new label.D. All labels will be exchanged for one new label.E. All labels will be exchanged for an equal number of new labels.



QUESTION 32If the destination IP address of a received unlabeled packet is successfully matched in the FIB, which of the following statements are true? Choose two answers.

A. A PUSH label stack operation must be performed.B. The outgoing interface and next-hop address will be determined from the FIB.C. The packet can be forwarded as a labeled or unlabeled packet.D. A POP label stack operation may be performed.

Correct Answer: BCSection: (none)Explanation


QUESTION 33Which of the following devices receives labeled packets from the MPLS domain, removes the MPLS header, and forwards unlabeled packets outside the MPLSdomain?

A. P routerB. LSRC. eLERD. iLER



QUESTION 34Which of the following statements are true? Choose two answers

A. Selected labels from the FIB are populated to the LIB.B. Selected labels from the LIB are populated to the LFIB.C. Selected routes from the RIB are populated to the FIB.D. Selected routes from the FIB are populated to the RIB.E. All labels from the LIB are populated to the LFIB.



QUESTION 35When a device receives a labeled packet, which of the following can occur?

A. The packet can only be forwarded as an unlabeled packet.B. The packet can be forwarded as a labeled or unlabeled packet, depending on the received label value.C. The packet can be forwarded as a labeled or unlabeled packet, depending on the destination IP address in the payloadD. The packet can only be forwarded as a labeled packet.



QUESTION 36Which of the following describes what happens when facility backup fast reroute is enabled for a LSP? Choose three answers.

A. Each PLR will signal a bypass tunnel that avoids the next-hop node or link.B. When a failure occurs, the PLR will push an additional label onto the label stack and start forwarding traffic onto its bypass tunnel.C. The ingress router will include a RRO object in the path message to indicate the routers that should be PLRs and MPs along the protected path.D. The ingress router will set the local protection desired flag in the session attribute object of the path message to inform all routers along the protected LSP path

to establish bypass tunnels.E. When the bypass tunnel is in use, the MP will include the RRO object in its PathErr message, with the local protection in use flag set to notify the ingress router

that it is using the bypass tunnel.

Correct Answer: ABDSection: (none)Explanation


QUESTION 37True or False? MPLS may use an existing data link layer header field to identify a label, instead of using a specific MPLS header

A. TRUEB. FALSE



QUESTION 38Which one of the following statements regarding the detour object transported in the detour path message is true?

A. The PLR sends it downstream with the RRO.B. The PLR sends it downstream with the ERO.C. It associates all detours with the source PLR.D. The MP sends it upstream with the RESV message.



QUESTION 39What MPLS function should be performed by a router that receives a data packet containing an MPLS label value of 3?

A. A router will never receive a packet containing this label value.B. Request a new label from the peer that provided this label.C. Pop the label.D. PUSH an additional label onto the label stack.E. Signal a new label to the peer that sent the packet.



QUESTION 40Which of the following is described by the following statement? An LSR propagates a label mapping only for an FEC for which it has a label mapping for the FECnext-hop.

A. Independent control mode.B. Ordered control mode.C. Liberal label retention.D. Conservative label retention.E. Downstream on demand



QUESTION 41Which of the following statements regarding per-platform label space are true? Choose two answers.

A. A separate label is used for each interface that the FEC is advertised on.B. It uses fewer label resources than a per-interface label space.C. It is typically used when the device has ATM or Frame Relay interfaces.D. It uses more label resources than a per-interface label space.E. A single label may be assigned to an FEC and used across all interfaces of the same router.F. It is only valid when the LDP peers are directly connected over an interface, and the label is only going to be used for traffic sent over that interface.

Correct Answer: BESection: (none)Explanation


QUESTION 42Which of the following can be used for label signaling and distribution on the Alcatel-Lucent 7750 SR? Choose two answers

A. RSVP-TEB. TDPC. LDPD. ADPE. MPLS-TE



QUESTION 43Which of the following are top level TLV types defined for OSPF-TE? Choose two answers.

A. Router addressB. Traffic engineering metricC. Maximum bandwidthD. LinkE. Admin Group

Correct Answer: ADSection: (none)Explanation


QUESTION 44In MPLS, how is the label range 0 ?15 used?

A. Static LSPsB. Reserved useC. Vendor proprietary useD. Management LSPsE. Dynamic LSPs



QUESTION 45Which of the following are characteristics of ECMP LSPs in LDP? Choose three answers

A. Liberal label retention modeB. T-LDP enabled with peers to which load balancing is desired.C. ECMP enabled in the config>router context.D. Hashing used to select the egress label.E. Export policy applied to advertise multiple labels for a given FEC.

Correct Answer: ACESection: (none)Explanation


QUESTION 46LDP is enabled on both ends of a point-to-point link, but the "show router Idp status" command indicates that LDP is operationally down. The Oper Down Reasonfield shows the message "systemIpDown." What might cause this condition?

A. The LSP is in the administrative down state.B. The router's router ID overlaps another.C. The router's interfaces do not have LDP running.D. The router's system interface requires an IP address



QUESTION 47Click on the exhibit button.

The policy on router R2 is applied as an LDP export policy. What FECs now appear in router R2's LIB?

A. Local FECs, not including those in the 192.168.1.0/24 address space.B. Only system ID FECs may appear in the LIB.C. Any local FECs, except those with a 24 bit mask.D. Local FECs in the 192.168.1.0/24 address space



QUESTION 48

How does MPLS-TE overcome the issue of IP hyper-aggregation?

A. By enabling the creation of LSPs across alternate links to balance the network traffic.B. By eliminating the requirement for core IP routing.C. By not allowing more than one LSP to use a particular path.D. By defining multiple LSPs across a network and implementing an IGP load balancing algorithm across them.


Explanation/Reference:valid and updated.


Consider the output shown; why is the label in bold font not in use?

A. The router cannot do a SWAP of this label.B. The label does not match the egress label for the same FEC.C. The label is for a FEC for which the next-hop is the peer routerD. The label was signaled in error.



QUESTION 50Which of the following timers can be adjusted to reduce the time a router waits between attempts to re-establish an LSP after it has failed?

A. Isp retry-timerB. Isp retry-limitC. mpls resignal-timerD. rsvp refresh-timeE. router rsvp keep-multiplier



QUESTION 51Which of the following LDP messages are used in the successful establishment of LDP sessions? Choose three answers

A. Label request messageB. Notification messageC. Address messageD. Keepalive messageE. Initialization messageF. Hello message

Correct Answer: DEFSection: (none)Explanation



Consider the output shown; what table is displayed?

A. RIBB. FIBC. LIBD. LFIB



QUESTION 53Click on the exhibit button below. Assume the following:

- The protected path is R1-R2-R3-R6.- Fast reroute one-to-one protection is enabled.

If the original LSP already has two labels, and router R2 has failed, how many labels will there be in packets on the detour path?

A. 1B. 2C. 3D. 4




Under which condition might the peer LDP ID 10.10.10.2:0 entry show state "Nonexistent"?

A. When the interface to the peer router is down.B. When router R1 has no route to the peer address 10.10.10.2.C. When the adjacency between the two routers fails.D. When the targeted session is not yet configured.



QUESTION 55Click on the exhibit button below. Assume the following:

- Each router's OSPF interfaces are in the areas shown.- Bidirectional LDP-over-RSVP tunnels extend from routers R1 to R3 and back over the path R1-R4-R5-R3.- You enable fast reroute facility bypass on the R5-R3 RSVP LSP.- Router R5 acts as a PLR, protecting the R5-R3 link by building a bypass tunnel through router R2.

You build a layer 2 VPN on routers R1 and R3, using the LDP-over-RSVP tunnels. What MPLS configuration step must you complete on router R2 for it to protectthe end-to-end service?

A. Enable LDP on the R2-R5 interface.B. Configure T-LDP sessions between routers R2 and R5 and R3.C. Configure LDP-over-RSVP support on router R2.D. Enable MPLS and RSVP on the router R2 network interfaces.E. Enable LDP on the R2-R5 and R2-R3 interfaces.

Correct Answer: DSection: (none)

Explanation


QUESTION 56Which of the following configurations allow a router to periodically attempt to move LSP traffic to a better path, if the head end can find one?

A. configure router mpls retry-timer 30B. configure router mpls resignal-timer 30C. configure router mpls retry-attempts 30D. configure router mpls global-revertive 30



QUESTION 57Which one of the following statements regarding RSVP LSP configuration is true?

A. LSPs must always terminate on a system ID.B. MPLS and RSVP must be enabled on all routers.C. Interfaces must be individually created in RSVP.D. Path definitions must include at least one hop entry.



QUESTION 58Which of the following conditions must a router meet for an LSP path's RSVP session to exist? Choose two answers

A. The router must build the Path State Block (PSB).

B. The router must build the Reservation State Block (RSB).C. The router must build the Session State Block (SSB)D. The router must send the second RESV refresh message.E. The router must receive the second PATH refresh message.

Correct Answer: ABSection: (none)Explanation


QUESTION 59Which of the following is a primary cause of IP hyper-aggregation?

A. IP routing protocols do not always select the best route to a destination.B. IP routing protocols always select multiple routes to a destination.C. IP routing protocols do not make use of all available network attributes to select a pathD. Improper network design results in limited network path redundancy.




Given the configuration below, which of the following commands would enable fast reroute on the LSP? Choose two answers

A. This configuration already is configured for FRR.B. fast-reroute facilityC. fast-reroute one-to-oneD. secondary <name>E. standby

Correct Answer: BCSection: (none)

Explanation



LSP 1's link between routers R3 and R6 has failed, and the RESV state at router R3 has timed out. Which of the following actions will router R3 initiate?

A. Send a Path Tear message towards router R6.

B. Send a Path Tear message towards router R1.C. Send a Resv Tear message toward router R6.D. Send a Resv Tear message toward router R1.



QUESTION 62Which of the following are features of RSVP-TE? Choose three answers.

A. It supports IGP-based LSPs.B. It supports constrained path LSPs.C. It does not support loose explicit path LSPs.D. It is recommended for use in Traffic Engineering applications.E. It cannot be used with facility backup fast reroute.



QUESTION 63Router R3 signals an LSP, reserving 1Gbps bandwidth on a 10Gbps link. RSVP configuration limits reservable bandwidth to 20 percent on the egress interface.Which of the following statements is true?

A. The egress RSVP interface has 80 percent bandwidth unreserved.B. LSPs can reserve an additional 9.9 Gbps bandwidth on this RSVP interface.C. The head end reserves 100Mbps for the LSP.D. The egress RSVP interface has 1Gbps bandwidth unreserved.

Correct Answer: DSection: (none)

Explanation


QUESTION 64Which of the following devices can originate an opaque LSA?

A. TE enabled OSPF routersB. Backbone router onlyC. ABR onlyD. ASBR only



QUESTION 65Which of the following statements regarding admin groups is FALSE?

A. Admin groups can be configured using the command "configure>router>mpls>admin-group".B. CSPF uses the information defined by admin groups when paths are computed for constraint- based LSPs.C. By default, interfaces for which MPLS has been enabled are in the default admin group.D. A LSP can make use of admin groups for constraint-based path calculations by including or excluding the admin group



QUESTION 66Which LSA is used for OSPF-TE purposes?

A. Type 9 LSA ?Link local LSA

B. Type 10 LSA ?Area local LSAC. Type 8 LSA ?TE router LSAD. Type 11 LSA ?Network LSA



QUESTION 67How have Traffic Engineering extensions to IS-IS been implemented?

A. By defining new LSAs for the IS-IS protocol.B. By utilizing the OSPF opaque LSAs to maintain interoperability with OSPF routing domainsC. By defining new TE extension TLVs to the IS-IS protocol.D. By enabling CSPF algorithm extensions that allow link state TE to be implemented.


Explanation/Reference:New Questions

MPLS_4A0103_v3

QUESTION 68The destination IP address of a received unlabeled packet is successfully matched in the FIB.

Which of the following is FALSE?

A. A POP label stack operation may be performed.B. The outgoing interface and next-hop address will be determined from the FIB.C. The packet can be forwarded as a labeled or unlabeled packet.D. A PUSH label stack operation may be performed.

Correct Answer: A

Section: (none)Explanation


QUESTION 69Fill in the blanks: The device at the beginning of an LSP is referred to as the_________, and the device at the end of an LSP is referred to as the ___________.

A. PE, PB. LER, LSRC. LSR, LERD. iLER, eLERE. eLER, iLERF. P, PE



QUESTION 70What is the goal of MPLS Traffic Engineering?

A. To establish additional LSPs across the networkB. To allow ECMP to occur across an MPLS networkC. To enable the implementation of servicesD. To utilize paths other than the lowest cost path



QUESTION 71

Which of the following about per-interface label space is TRUE?

A. A single label is assigned to a FEC for all interfaces on the same router.B. The same label can be used to forward a packet on an LSR regardless of which egress port is used.C. It uses fewer label resources than a per-platform label space.D. A separate label is used for each interface that the FEC is advertised on.



QUESTION 72What is the purpose of the MPLS TC field (EXP bits)?

A. Each implementation can use it as they see fit.B. It is used to carry the Ether type value.C. It is used to carry the TTL value.D. It is used to carry QoS classification.E. It is used to carry fragmentation flag information.



QUESTION 73An Alcatel-Lucent 7750 SR label switches a packet it receives. The packet has an outer label TTL of 250 and an inner label TTL of 251. Which of the following isTRUE?

A. The outer label TTL will be 249 and the inner label TTL will be 250.B. The outer label TTL will be 249 and the inner label TTL will be 251.C. The outer label TTL will be 251 and the inner label TTL will be 251.D. The outer label TTL will be 251 and the inner label TTL will be 252.



QUESTION 74Which mode does the following statement describe? An LSR will advertise a label mapping immediately, without waiting for a label mapping from the FEC's next-hop.

A. Liberal label retention modeB. Conservative label retention modeC. Ordered control modeD. Independent control mode



QUESTION 75Which of the following about RSVP-TE is TRUE?

A. RSVP-TE is a routing protocol.B. RSVP-TE requests end-to-end resources for unidirectional data flow.C. RSVP-TE consults the local RSVP database to determine the path from source to destination.D. RSVP-TE generates a TED for storing traffic engineering information.



QUESTION 76Which of the following regarding MPLS Encapsulation is FALSE?

A. The customer's Layer 2 header is preserved at the iLER for Layer 2 services.B. The customer's Layer 2 Header is preserved at the iLER for Layer 3 services.C. The service provider's Layer 2 header is added at the iLER for Layer 2 services.D. The service provider's Layer 2 header is added at the iLER for Layer 3 services.



QUESTION 77What action does a router perform when it looks up the label of an incoming packet in its LFIB and sees that the LFIB maps to an egress label of 3?

A. It requests a new label from the peer that provided this label.B. It pops the label.C. It pushes an additional label onto the label stack.D. It signals a new label to the peer that sent the packet.



QUESTION 78Click on the exhibit.

Under which condition might the peer entry with an LDP ID of 10.10.10.2:0 show the state "Nonexistent"?

A. When the interface to the peer router is down.B. When router R1 has no route to the peer address 10.10.10.2.C. When LDP is not configured on the peer router's interface.D. When the targeted session is not configured.




Given the output below, which of the following is FALSE?

A. A packet arriving with label 131066 will be forwarded out interface 1 /1 /4 with label 131070.B. The router is an egress router for FEC 10.10.10.221/32.C. There are multiple LSPs to reach FEC 10.10.10.244/32.D. The router's system address is 10.10.10.242/32.

Correct Answer: D



QUESTION 80Which of the following about Alcatel-Lucent 7750 SR command "oam Isp-trace prefix" is FALSE?

A. The router performs a unidirectional LSP test.B. The router collects hop information along the tunnel's path.C. The router uses MPLS Echo Request packets that are IP-routed,D. The MPLS TTL values are incremented at each request.





Router R2 advertises an OSPF summary route 10.10.10.0/24 into Area 1. Router R3 receives labels for individual FECs 10.10.10.2/32 and 10.10.10.4/32. Thesetwo FECs are installed in router R3's LIB but not in the LFIB. What needs to be done on router R3 to install these labels into its LFIB?

A. Disable route summarization on router R3.B. Enable LDP aggregate prefix match.C. Create an import policy to accept 10.10.10.2/32 and 10.10.10.4/32.D. Disable LDP exact match on 10.10.10.2/32 and 10.10.10.4/32.



QUESTION 82

Click on the exhibit.

This policy is applied as an LDP export policy. In addition to the FECs learned from its neighbors, which FECs now appear in the router's LIB?

A. Local FECs not included in the 192.168.1.0/24 address space and the system IP FEC.B. Only the system IP FEC appears in the LIB.C. Any local FECs, except those with a 24-bit mask.D. Local FECs in the 192.168.1.0/24 address space.



QUESTION 83Which of the following are the default settings for the Alcatel-Lucent 7750 SR when using LDP?

A. Per-platform label space, conservative retention modeB. Per-interface label space, conservative retention modeC. Per-platform label space, liberal retention modeD. Per-interface label space, liberal retention mode



QUESTION 84Which of the following about T-LDP is FALSE?

A. Link-based and T-LDP sessions may be configured on the same LSR.B. T-LDP supports sessions between non-directly connected devices.C. T-LDP can be configured between directly connected devices.D. T-LDP Hello messages are sent to a multicast address.



QUESTION 85Which of the following LDP message categories is UDP-based?

A. NotificationB. SessionC. DiscoveryD. Advertisement



QUESTION 86Two directly connected routers set different interface Hello timeout values. Router R1 uses 15 seconds, while router R2 uses 30 seconds. Which of the followingbest describes the LDP adjacency?

A. The adjacency forms with the lower timeout value.B. The adjacency forms with the higher timeout value.C. The adjacency is in init state.D. The adjacency times out after 30 seconds.



QUESTION 87An Alcatel-Lucent 7750 SR enabled with LDP has multiple equal cost paths to a given FEC. After ECMP is enabled, which of the following is FALSE?

A. The router has new entries added for the given FEC in its LIB.B. The router has new entries added for the given FEC in its FIB.C. The router generates a single label for the given FEC and advertises it to all its peers,D. The router has multiple LSP tunnels for the given FEC.



QUESTION 88Which of the following about the RSVP-TE Hello protocol is FALSE?

A. The Hello protocol can speed up convergence without reducing refresh time.

B. Hello messages are sent after at least one RSVP session is active on the interface.C. An interface with multiple RSVP sessions sends Hello messages for each session.D. An RSVP neighbor is declared down if Hello messages are not received within the Hello timeout.



QUESTION 89Which of the following describes how a router sets the destination IP address for an RSVP RESV message?

A. It sets the address to the system address of the head-end router.B. It sets the address to the next upstream hop from the ERO.C. It sets the address to the next upstream hop from the PSB.D. It sets the address to the next upstream hop from the RRO.



QUESTION 90Which of the following about RSVP-TE on an Alcatel-Lucent 7750 SR is TRUE?

A. Label bindings are distributed to other routers when explicitly requested.B. Label bindings are distributed to all neighbors including non-downstream routers.C. Label bindings are distributed if labels have not been received from downstream routers.D. All labels received from downstream neighbors are stored in the LIB.




RSVP state for LSP 1 has timed out on router R3. Which of the following actions will router R3 initiate to clear the RSVP session?

A. Send a RESV Tear message toward router R6.B. Send a RESV Tear message toward router R1.C. Send a RESV Error message toward router R6.D. Send a RESV Error message toward router R1.

Correct Answer: B



QUESTION 92Which of the following about the Alcatel-Lucent 7750 SR command "own Isp-trace" is FALSE?

A. The MPLS TTL values are incremented at each request.B. The router uses MPLS Echo Request packets that are IP-routed.C. The router collects hop information along the tunnel's path.D. The router performs an unidirectional LSP test.




Initially, all links have 800Mbps of unreserved bandwidth. All links are of equal costs. Shared explicit reservation style is used. LSP 1 is signaled first with a setupand hold priority of 2. Then, LSP 2 is signaled with setup and hold priority of 5. Both LSPs go from R1 to R5. Which of the following is TRUE?

A. LSP 1 will follow R1-R3-R4-R5. LSP 2 will follow R1-R2-R5.B. LSP1 will follow R1-R2-R5. LSP 2 will follow R1-R3-R4-R5.C. Both LSP 1 and LSP 2 will follow R1-R2-R5.D. Both LSP 1 and LSP 2 will follow R1-R3-R4-R5.



QUESTION 94Which of the following about LDP-over-RSVP is TRUE?

A. RSVP LSPs must exist between each PE-ABR pair, or ABR-ABR pair in each area.B. When LDP-over-RSVP is active, the LDP prefixes are resolved to a physical egress interface.C. Targeted sessions must exist between all routers along the tunnel path.D. Link LDP sessions must exist between each ABR-ABR pair in each area.



QUESTION 95Which of the following about CAC is FALSE?

A. CAC is used when the LSP path has not been computed by CSPF.B. CAC is used when the LSP path has been computed by CSPF.C. CAC is used to perform a bandwidth check on each egress interface of the downstream router.D. CAC is used to perform a bandwidth check based on the router's LSDB.




The link between routers R4 and R6 is down before the LSP is signaled. CSPF is enabled on the LSP. Which of the following conditions is TRUE?

A. Router R1 sends a PATH message and router R4 sends back a PATH Error message.B. Router R1 does not send a PATH message because it detects an error.C. Router R1 sends a PATH message and router R4 sends back a PATH Tear message.D. Router R1 sends a PATH message and router R4 sends back a RESV Error message.



QUESTION 97Which of the following is NOT an advantage of MPLS shortcuts for BGP traffic?

A. It makes use of MPLS resiliency features available within an AS.B. It eliminates double route lookups on all routers within an AS.C. It eliminates the need to run IGP on all routers within an AS.D. It eliminates the need for an iBGP full mesh on all core routers.



QUESTION 98Which of the following about configuring an LSP path definition on an Alcatel-Lucent 7750 SR is FALSE?

A. A path definition can have both loose and strict hops.B. A path definition can be configured with loose hops only.C. A path definition is configured on the head-end router only,D. A path definition is not required if CSPF is enabled on an LSP.



QUESTION 99A router has two admin groups defined (GREEN=1 and RED=3). An interface is associated to both admin groups. What value will be shown in the Admin Groupsub-TLV for this interface?

A. 0x4B. 0x5C. 0x10D. 0xa



QUESTION 100Which of the following about Link TLVs found inside Type 10 Opaque LSAs is FALSE?

A. Link TLVs are used to advertise administrative group information.B. Link TLVs are exchanged once RSVP is enabled on the interfaces.C. Link TLVs are used to advertise router-IDs.D. Link TLVs are used to advertise bandwidth information.




Initially, all links along the path R1-R2-R4-R6 have 400Mbps unreserved bandwidth and all links along the path R1-R3-R5-R6 have 800Mbps unreserved bandwidth.Shared Explicit reservation style is used and Make-Before-Break is enabled. Both fully loose LSPs have been signaled as shown. Later, the configured bandwidthfor LSP-1 is changed to 400Mbps. Which of the following is TRUE?

A. After a new path for LSP-1 is established on R1-R3-R5-R6, the old path is torn down.B. After the old path for LSP-1 is torn down, the new path is established on R1-R3-R5-R6.C. LSP-1 will stay on R1-R2-R4-R6 because there is enough bandwidth on the existing path.D. LSP-1 will be torn down because CSPF fails to find a new path.



QUESTION 102Which of the following describes constraint-based routing?

A. A mechanism that implements opaque LSAs.B. A mechanism that computes routes based on specified requirements.C. A mechanism that ensures the IGP best route is used.D. A mechanism that enables LDP signaling to use a route other than the IGP best route.



QUESTION 103Which of the following is NOT required to configure an Alcatel-Lucent 7750 SR as a PE router running 6PE?

A. Configure BGP with the IPv6 address family.B. Configure BGP to add IPv6 Explicit Null labels.C. Configure a route policy to export IPv6 routes into BGP.D. Configure the nexthop core router as a BGP peer.



QUESTION 104


All links have 1Gbps unreserved bandwidth initially and Shared Explicit reservation style is used. After the LSP's primary and standby secondary paths are signaled,how much unreserved bandwidth is left on the links?

A. R1-R2 will have 300Mbps left and R2-R4 will have 400Mbps left.B. R1-R2 will have 400Mbps left and R2-R4 will have 400Mbps left.C. R1-R2 will have 600Mbps left and R2-R4 will have 600Mbps left.D. R1-R2 will have 300Mbps left and R2-R4 will have 600Mbps left.



QUESTION 105Which of the following about LSPs is FALSE?

A. IGP-based LSPs are calculated based on information contained in routing tables.B. Constraint-based LSPs are calculated using the head-end router's TED.C. Constraint-based LSPs must use RSVP-TE signaling.D. IGP-based LSPs must use LDP signaling.




Exhibit Missing

All links have 1Gbps unreserved bandwidth initially and all LSPs have the least-fill feature enabled. After the two LSPs have been signaled as shown, two new LSPsare configured. LSP-3 is signaled first with 600Mbps reserved. LSP-4 is signaled after with 800Mbps reserved. All LSPs have the same setup and hold priorities.Which paths will CSPF choose for LSP-3 and LSP-4?

A. LSP-3 takes R1-R3-R5-R6 and LSP-4 takes R1-R2-R4-R6.B. LSP-3 takes R1-R2-R4-R6 and LSP-4 takes R1-R3-R5-R6.C. LSP-3 takes R1-R3-R5-R6 and LSP-4 has no available path.D. LSP-3 takes R1-R2-R4-R6 and LSP-4 has no available path.




An LDP-over-RSVP tunnel is established between routers R1 and R6. There is a VPN service running between routers R1 and R6. Which of the following is TRUE?

A. Router R4 swaps both the RSVP-TE LSP label and LDP transport label received with new labels,B. Router R4 swaps the VPN service label received with a new label.C. Router R4 uses the same RSVP-TE LSP label as the one received from router R3.D. Router R4 uses the same LDP transport label as the one received from router R3.



QUESTION 108An LSP is enabled with one-to-one fast reroute and node protection. What action does the PLR take if node protection cannot be provided?

A. The PLR attempts to provide link protection.B. The PLR disregards the request after three failed attempts.C. The PLR changes the PATH message to request link protection.

D. The PLR brings down the primary LSP-path.




An LSP traverses the path R1-R2-R3-R6 and facility fast reroute is enabled. If the protected LSP carries one transport label and one service label, how many labelswill be on the bypass tunnel if router R2 fails?

A. 1B. 2C. 3D. 4



QUESTION 110Which of the following about MPLS fast reroute is TRUE?

A. Fast reroute is used when redundant links are not available.B. Fast reroute provides path protection close to the failure point.C. Fast reroute provides fast failure detection to the head-end router.D. Fast reroute protects both primary and secondary paths.




An LDP tunnel is established on R1-R2-R4-R6 because the link between routers R3 and R6 is down. With the LDP-IGP Sync feature enabled and after the link isrestored, which of the following is FALSE?

A. Router R3 starts the LDP-Sync timer after recovering the LDP session on R3-R6.B. Router R1 continues to use R1-R2-R4-R6 until the LDP-Sync feature is disabled.C. Router R3 advertises the maximum metric for the link to router R6.D. Router R1 receives a label from router R3 after the LDP session is established on R3-R6.



QUESTION 112Using facility mode fast reroute, how does the PLR learn the address of the MP?

A. The PLR issues an RSVP PATH message to the tail-end requesting the address of the MP.B. The PLR learns the address of the MP from the ERO.C. The PLR learns the address of the MP from the RRO.D. The PLR learns the address of the MP from the targeted RSVP Hello message.E. The PLR knows the address of the MP is the same as the tail-end router.




An LSP path is established on router R1 toward router R6. After router R4 detects that the link between routers R4 and R6 goes down, which of the following willaffect the failure propagation time?

A. The time router R4 takes to send a PATH Error message toward the head-end router.B. The time router R4 takes to detect RSVP Hello message timeout from router R6.C. The time router R4 takes to send a RESV Error message to the head-end router.D. The time router R1 takes to signal an alternate path through router R3.




An LSP traverses R1-R2-R4-R6 and facility fast reroute with link protection is enabled. All links have the same cost. Which of the following about PLRs and MPs isTRUE?

A. R1, R2, and R4 can be PLRs; R6 is the MP.B. R1, R2, and R4 can be PLRs; R2, R4, and R6 are MPs.

C. R1, R2, R3, R4, and R5 can be PLRs; R6 is the MP.D. R1, R2, R3. R4, and R5 can be PLRs; R2, R4, and R6 is the MP.




Which of the following about the bypass tunnel is FALSE?

A. The router 10.10.10.1 is a PLR providing node protection for the router 10.10.10.3.B. One-to-one fast reroute protection is requested by an LSP.C. The bypass-link tunnel is used to avoid the link with the egress interface address 10.3.4.4.D. The bypass-node tunnel is used to avoid the next-hop downstream router 10.10.10.3.

Correct Answer: B




All links are operationally up initially. When the link between routers R4 and R6 goes down, what will router R1 do?

A. Router R1 will switch traffic to the secondary path immediately.B. Router R1 will discard traffic until a new IGP route to router R6 is re-calculated.

C. Router R1 will discard traffic because the secondary path is not a fully strict path.D. Router R1 will signal the secondary path and switch traffic to it.




All links are of equal cost. A CSPF-enabled LSP is configured on R1 to R6. Its fully loose primary path is configured with an "include green" statement and the fullyloose secondary path is configured with an "include red" statement.

Which paths will be taken by this LSP?

A. No primary path is established. The secondary path will take R1-R2-R4-R6.B. The primary path will take R1-R3-R5-R6. The secondary path will take R1-R2-R4-R6.C. The primary path will take R1-R2-R4-R6. No secondary path is established.D. The primary path will take R1-R2-R4-R6. The secondary path will take R1-R3-R5-R6.



QUESTION 118Which of the following about an LSP protected with one-to-one FRR is TRUE?

A. The LSP can use facility and one-to-one FRR simultaneously.B. The LSP is limited to node protection.C. A single protection tunnel is used for all LSPs with the same path.D. A detour protection tunnel is created for the LSP.




Both Path-1 and Path-2 are down. If Path-2 becomes available again, how does the headend router select the secondary LSP path?

A. The router will switch to Path-2 because it is the first secondary path configured in the list.B. The router will not switch to Path-2 because the current path has the longest uptime.C. The router will switch to Path-2 because it is a more preferred path.D. The router will not switch to Path-2 because the router will not revert to another secondary path.




A fully loose LSP "toR6" is enabled with FRR protection. All links have the same cost. After the link between R2 and R4 goes down, FRR protection repairs the LSPand traffic traverses on R1- R2-R7-R8-R4-R6. Which of the following about this CSPF-enabled LSP on an Alcatel-Lucent 7750 SR is TRUE?

A. The LSP will stay on the current path indefinitely unless another failure occurs.B. The LSP will stay on the current path until the resignal timer expires.

C. The LSP will switchover to R1-R2-R3-R5-R6 after the resignal timer expires.D. The LSP will switchover to R1-R3-R5-R6 after the retry timer expires.


Explanation/Reference:ENU103-1st

QUESTION 121Which of the following regarding the MPLS SWAP label operation is TRUE?

A. The inner label will be exchanged with the MPLS outer label.B. The inner label will be exchanged for a new label.C. The outer label will be exchanged for a new label.D. All labels will be exchanged for one new label.E. All labels will be exchanged for an equal number of new labels.



QUESTION 122Which of the following is a function of the control plane in an MPLS router?

A. Label swappingB. Pushing a label on an unlabeled packetC. Label allocationD. Routing lookups



QUESTION 123Which of the following best describes downstream unsolicited label distribution?

A. An LSR may answer requests for label mappings immediately, without waiting for a label mapping from the next-hop.B. An LSR may advertise label mappings to all peers for which it might be a next-hop for a given FEC.C. An LSR propagates a label mapping downstream for a FEC, only if it has a label mapping for the FEC next-hop.D. An LSR will only distribute a label for a FEC when it has been requested to do so.



QUESTION 124Which of the following about T-LDP on the Alcatel-Lucent 7750 SR is FALSE?

A. T-LDP is used to provide an end-to-end session between two PE routers.B. T-LDP is used to signal service labels for Layer 2 services.C. T-LDP is used to establish transport tunnels for Layer 2 services.D. T-LDP is used in LDP over RSVP solution.



QUESTION 125Which mode does the following statement describe? An LSR will advertise a label mapping immediately, without waiting for a label mapping from the FEC's next-hop.

A. Liberal label retention modeB. Conservative label retention modeC. Ordered control mode

D. Independent control mode



QUESTION 126What MPLS function should be performed by a router that receives a data packet with an MPLS label value of 0?

A. Push an additional label onto the label stack.B. Pop the label.C. Swap the label.D. Pop the label and push an additional label onto the label stack.




Router R2 advertises the aggregate prefix 10.10.10.0/24 into Area 1. Why would LDP aggregate- prefix-match be enabled on router R3?

A. To reduce the number of LDP sessionsB. To reduce the number of LIB and LFIB entriesC. To bypass the LDP exact prefix match ruleD. To export summarized routes from OSPF to LDP



QUESTION 128Which of the following LDP settings can be changed with CLI?

A. Label space modeB. Label retentionC. Control modeD. Keepalive factor



QUESTION 129Which of the following about an established LDP session is TRUE?

A. It uses a UDP connection with an arbitrary port number.B. It uses a UDP connection with well-known port number 646.C. It uses a TCP connection with an arbitrary port number.D. It uses a TCP connection with well-known port number 646.




This policy is applied as an LDP export policy. In addition to the FECs learned from its neighbors, which FECs will appear in this router's LIB?

A. All FECs with a prefix of 192.168.1.0/30.B. Local FECs with a prefix of 192.168.1.0/30.C. All FECs excluding 192.168.1.0/30.D. Local FECs excluding 192.168.1.0/30.




Why might router R2 have a Link LDP session to R1 (10.10.10.1:0) but not to R3 (10.10.10.3:0)?

A. LDP is not configured on R2.B. R2 does not have a route to 10.10.10.3.C. LDP is not configured on R3's interface to R2.D. The targeted session is not configured on R2.



QUESTION 132Which of the following is NOT an advantage of RSVP-TE compared to LDP?

A. RSVP-TE supports Connection Admission Control (CAC).B. RSVP-TE enables simplified configuration of LSPs.C. RSVP-TE supports path calculations that do not use IGP cost.D. RSVP-TE provides support for traffic protection features.



QUESTION 133An LSP is configured with a fully loose path and CSPF is not enabled. An LSR receives the first PATH message for this LSP. Which of the following is NOTperformed by the LSR?

A. The LSR regenerates and forwards a new PATH message.B. The LSR stores the PATH message in the PSB.C. The LSR forwards the PATH message based on the HOP object in the RSB.D. The LSR looks up the PATH message's destination IP address in the FIB.



QUESTION 134Which of the following about RSVP-TE LSP configuration in a Alcatel-Lucent 7750 SR is TRUE?

A. LSPs must always terminate on a system ID.B. MPLS and RSVP must be enabled on all LSRs.C. CSPF must be enabled.D. Path definitions must include at least one hop entry.


Explanation


QUESTION 135Which of the following modes are used by RSVP-TE on an Alcatel-Lucent 7750 SR?

A. Independent control mode, downstream on demandB. Independent control mode, downstream unsolicitedC. Ordered control mode, downstream on demandD. Ordered control mode, downstream unsolicited



QUESTION 136Which of the following about RSVP refresh reduction on a Alcatel-Lucent 7750 SR is FALSE?

A. RSVP generates a summary refresh message for each LSP.B. Message-IDs replace individual refresh messages.C. An LSP state change causes the Message-ID to be incremented.D. RSVP refresh reduction is disabled by default.




The link between routers R4 and R6 are configured with an admin group "red". What happens when the LSP is first signaled?

A. The LSP will go through the path R1-R2-R4-R6.B. The LSP will go through the path R1-R3-R5-R6.C. The LSP is down because router R1 detects that no path can meet its constraints.D. The LSP is down because router R4 detects that no path can meet its constraints.




All links have 1 Gbps unreserved bandwidth initially. After the LSP's primary and standby secondary paths are signaled, how much bandwidth is reserved on the linkbetween routers R1 and R2?

A. If Shared Explicit reservation style is used, 400Mbps is reserved.B. If Shared Explicit reservation style is used, 700Mbps is reserved.

C. If Fixed Filter reservation style is used, 400Mbps is reserved.D. If Fixed Filter reservation style is used, 300Mbps is reserved.




An LDP-over-RSVP tunnel is established between routers R1 and R6. There is a VPN service running between routers R1 and R6. Which of the following is TRUE?

A. Router R3 swaps both the RSVP-TE LSP label and LDP transport label received with new labels.B. Router R3 swaps the VPN service label received with a new label.C. Router R3 uses the same RSVP-TE LSP label as the one received from router R2.D. Router R3 uses the same LDP transport label as the one received from router R2.



QUESTION 140An Alcatel-Lucent 7750 SR has its TE update threshold enabled with the up threshold set to 40%. The maximum reservable bandwidth on the link is 200M and 30Mhave already been reserved. When will a TE update be sent on this link?

A. When the reserved bandwidth goes above 80M.B. When the reserved bandwidth goes above 40M.C. When an additional 80M bandwidth is reserved.D. When an additional 40M bandwidth is reserved.




Which of the following CANNOT be used to ensure the LSP toR6" will follow the path R1-R2- R4-R6?

A. Admin groupsB. Hop-limitC. Strict hopsD. TE-Metric




All links have 1 Gbps unreserved bandwidth initially and all LSPs have the least-fill feature enabled. After the two LSPs have been signaled as shown, two additionalLSPs are configured.

LSP-3 is signaled first with 50Mbps reserved. LSP-4 is signaled after with 400Mbps reserved.

Which paths will CSPF choose for LSP-3 and LSP-4?

A. Both LSP-3 and LSP-4 take R1-R2-R4-R6.B. Both LSP-3 and LSP-4 take R1-R3-R5-R6.C. LSP-3 takes R1-R3-R5-R6 and LSP-4 takes R1-R2-R4-R6.D. LSP-3 takes R1-R2-R4-R6 and LSP-4 takes R1-R3-R5-R6.E. CSPF randomly chooses one of the equal cost paths for the two LSPs.

A fully loose LSP MtoR6" is enabled with FRR protection. All links have the same cost. After the link between R2 and R4 goes down, FRR protection repairs theLSP and traffic traverses on R1-R2-R7-R8-R4-R6. By default, which of the following about this LSP on an Alcatel-Lucent 7750 SR is FALSE?

A. The LSP will switch to R1-R3-R5-R6 after the resignal timer expires.B. The old primary path and its detours are torn down after the new primary path is established.C. CSPF must be enabled to find a more optimal path.D. The traffic is switched to R1-R3-R5-R6 in an MBB fashion.



QUESTION 144Which of the following about an LSP protected with facility FRR is TRUE?

A. The LSP can use protection tunnels used by other LSPs.B. The LSP can use facility and one-to-one FRR simultaneously.C. The LSP is limited to link protection.D. A detour protection tunnel is created for this LSP.




An LSP path is established on router R1 toward router R6. If the link between routers R4 and R6 goes down, which of the following is the quickest way for servicerecovery?

A. Router R1 updates its FIB after a new SPF calculation.B. Router R1 switches to a secondary path.C. Router R4 switches to a FRR path.D. Router R4 switches to a standby secondary path.



QUESTION 146

LSP " to R8-5 " requests fast reroute protection. What could be done to remove the Failure Code shown?

A. The LSP must be enabled with CSPF on the head-end router.B. Fast reroute must be enabled on the downstream routers.C. A mixture of strict and loose hops must be defined in the primary path.D. CSPF and fast reroute must be enabled on all downstream routers.



QUESTION 147Which of the following about Fast Reroute node protection tunnels is FALSE?

A. Node protection tunnels detour around a failed next downstream router.B. Node protection tunnels can only be requested for a primary LSP path.C. Node protection tunnels are only used by one-to-one Fast Reroute.D. Link protection tunnels are established if a router is unable to establish node protection tunnels.



QUESTION 148Which of the following about the use of RRO in fast reroute is FALSE?

A. RRO is used to report the protection tunnel status to the head-end router.B. RRO contains the MP information that is required by a PLR for facility protection.C. RRO contains the label information that is expected by an MP for facility protection.D. RRO is used to inform downstream routers about the protection type requested.

Correct Answer: D


Explanation/Reference:answer is updated.


An LSP traverses R1-R2-R3-R6 and one-to-one fast reroute is enabled. If the protected LSP transports two labels, and router R2 has failed, how many labels will beon the detour path?

A. 1B. 2C. 3D. 4




An LSP's primary path takes R1-R3-R5-R6. Its fully loose secondary path is configured for SRLG. All links are of equal cost. Which path will the secondary pathtake?

A. The secondary path will take R1-R3-R2-R4-R6.B. The secondary path will take R1-R2-R4-R6.C. The secondary path will take R1-R2-R3-R5-R6.D. The secondary path will take R1-R3-R2-R4-R5-R6.





An LSP traverses the path R1-R2-R3. With one-to-one fast reroute enabled, which router becomes a DMP for the detour tunnels?


Correct Answer: ESection: (none)

Explanation

Explanation/Reference:ENU103-2nd

QUESTION 152Which of the following is NOT a characteristic of MPLS?

A. It provides the ability to establish connection oriented paths over a connectionless IP network.B. It provides a mechanism to engineer network traffic patterns independently of IP routing tables.C. It will work over most physical layer protocols.D. It can use GRE tunnels to transport data from many different protocols over an IP network.



QUESTION 153Which of the following regarding per-platform label space is TRUE?

A. A separate label is used for each interface on which the FEC is advertised.B. A single label is assigned to a FEC for all interfaces on the same router,C. It is typically used when the device has ATM or Frame Relay interfaces.D. It uses more label resources than a per-interface label space.



QUESTION 154Which of the following is TRUE when the explicit null is implemented?

A. The penultimate router will forward packets to the eLER, based on the IP header.

B. The eLER will receive packets with a top label value of 0.C. The eLER will receive packets with a top label value of 3.D. The penultimate router will pop the top label from the packets.



QUESTION 155If an Alcatel-Lucent 7750 SR is an iLER operating in pipe mode, which of the following regarding the TC field (EXP bits) is TRUE?

A. The TC field is set based on the value of the DSCP field inside the customer packet.B. The TC field is set to a specific value via explicit administrative configuration.C. The TC field is set to a system generated random number.D. The TC field is set by the eLER.



QUESTION 156Which MPLS label mode propagates a label mapping only for the FEC for which a router has a label mapping for the FEC's next-hop?

A. Independent control modeB. Ordered control modeC. Liberal label retention modeD. Conservative label retention modeE. Downstream on demand label distribution mode



QUESTION 157Which of the following best describes downstream on demand label distribution?

A. An LSR answers requests for label mappings immediately, without waiting for a label mapping from the next-hop.B. An LSR advertises label mappings to all peers for which it might be a next-hop for a given FEC.C. An LSR distributes a label mapping for a FEC when it has been requested to do so.D. An LSR propagates a label mapping downstream for a FEC. only if it has a label mapping for the FEC's next-hop.



QUESTION 158Which of the following regarding MPLS label value assignment is FALSE?

A. Label values may be dynamically assigned by LDP.B. Label values may be dynamically assigned by RSVP-TE.C. Label values may be reserved for special uses.D. Label values may be dynamically assigned by IGP.



QUESTION 159Which of the following is a characteristic of LDP Hello messages?

A. They are multicast to the All Hosts address.B. They are broadcast to the subnet broadcast address.

C. They are multicast to the All Routers address.D. They are broadcast or multicast, depending on the physical media.



QUESTION 160What is the purpose of a T-LDP session?

A. It allows link LDP to be configured on the edge devices only.B. It is used to signal the transport labels in the provider core.C. It allows selective control over which devices are configured for LDP.D. It is used to signal the service labels in the provider core.



QUESTION 161Which of the following about LDP sessions is TRUE?

A. Frame mode requires multiple sessions between peers.B. The lower transport address initiates the session.C. Established LDP sessions run over a TCP connection.D. An LDP session is established immediately after Init messages are exchanged between peers.




After the Isp-ping command is executed, which of the following best describe the router's action?

A. MPLS Echo Request packets are sent unlabeled to the prefix 192.10.1.2.B. MPLS Echo Request packets are sent within the LDP tunnel that are signaled for 192.10.1.2.C. MPLS Echo Request packets are sent within the RSVP-TE tunnel that are signaled for 192.10.1.2.D. MPLS Echo Request packets are sent over TCP.




When router R1 forwards a PATH message to router R2, which of the following about the PATH message's IP header is TRUE?

A. The options field is set to router alert.B. The source address is R1's egress interface address.C. The destination address is R2's ingress interface address.D. The HOP object includes R2's system address.



QUESTION 164


This LSP terminates on a system IP address. What is the system address of the destination node?

A. 10.32.1.2B. 10.1.4.78C. 10.48.1.1D. 10.1.2.2



QUESTION 165What are the default settings for RSVP-TE on the Alcatel-Lucent 7750 SR?

A. Per-interface label space, liberal retention modeB. Per-platform label space; liberal retention modeC. Per-interface label space, conservative retention modeD. Per-platform label space, conservative retention mode





A. The Isp-ping tool is used to perform a unidirectional LSP test.B. The router 10.10.10.2 is the egress router of the LSP.C. The router can reach the far-end of the LSP through an RSVP-TE tunnel.D. The router can reach the far-end of the LSP through an LDP tunnel.



QUESTION 167What labels are encapsulated in the tunnels used by a 6PE deployment?

A. The inner label is the IPv4 Explicit Null. The outer label is the MPLS transport label,B. The inner label is an MPLS transport label. The outer label is the IPv4 Explicit Null.C. The inner label is the IPv6 Explicit Null. The outer label is an MPLS transport label.D. The inner label is an MPLS transport label. The outer label is the IPv6 Explicit Null.



QUESTION 168Which of the following about an ERO in an RSVP PATH message is FALSE?

A. ERO is used by downstream routers to determine the next-hop for the LSP.B. ERO contains label information used to signal an LSP path.C. ERO is not always present in the PATH message.D. Each downstream router updates information inside the ERO.



QUESTION 169Which of the following about Type 10 opaque LSAs is TRUE?

A. Type 10 opaque LSAs are supported by IS-IS.B. Type 10 opaque LSAs are flooded to all areas of the routing domain.C. Type 10 opaque LSAs are stored in an LSDB.D. Type 10 opaque LSAs are used for traffic engineering support.



QUESTION 170Which of the following about MPLS shortcuts for IGP on an Alcatel-Lucent 7750 SR is FALSE?

A. An IGP route takes priority over a transport tunnel.B. Both LDP and RSVP-TE based tunnels can be used.C. MPLS tunnels can be used to resolve the prefixes learned via IGP.D. Multiple MPLS tunnels can be installed in the FIB.



QUESTION 171Initially, all ports on an Alcatel-Lucent 7750 SR have 10Gbps bandwidth. RSVP configuration limits reservable bandwidth to 30 percent on all interfaces. An LSP issignaled reserving 1 Gbps bandwidth. How much unreserved bandwidth is left on the interface?

A. 10 GbpsB. 7 GbpsC. 3 GbpsD. 2 Gbps

Correct Answer: D



QUESTION 172How does a DMP inform the downstream routers that it has merged detour tunnels?

A. The DMP sends the DMP_Object in each detour's PATH messages.B. The DMP summarizes PATH messages, giving each detour its own MSGJD.C. The DMP identifies itself as the previous hop in each detour's PATH message.D. The DMP sends a single PATH message containing the merged DETOUR_Objects.




Two LSPs traverse the path R1-R2-R3. Both LSPs are configured with facility fast reroute and link protection. When router R1 is the PLR, which router becomes theMerge Point (MP) for this LSP?





The path of a fast reroute protected LSP is R1-R2-R3. Which of the following about the protected LSP path is TRUE?

A. All routers along the path, R1, R2, and R3 can be PLRs.B. If the R1-R2 link fails, router R4 becomes an MP.C. If the R2-R3 link fails, router R3 becomes a PLR.D. Router R1 is the LSP head-end and can be a PLR.


Explanation/Reference:answer is corrected.


If the primary path fails, which backup LSP path will the head-end router pick first?

A. The Standby with the highest next-hop IP.B. The first Standby in the list.C. The Standby with the longest uptime.D. The Standby with the lowest next-hop IP.



QUESTION 176Which of the following about Fast Reroute link protection tunnels is FALSE?

A. Link protection tunnels are established if a router is unable to establish node protection tunnels.B. Link protection tunnels are only requested for a primary LSP path.C. Link protection tunnels can be created for both one-to-one or facility Fast Reroute.D. Link protection tunnels detour around a failed next downstream router.



QUESTION 177An LSP is configured with one-to-one FRR and node protection on a Alcatel-Lucent 7750 SR.Which of the following is FALSE?

A. Each PLR signals a protection tunnel that avoids the downstream node.B. A single protection tunnel can protect all LSPs that go through the same hop.C. A link protection tunnel is signaled if a node protection tunnel cannot be established.D. Protection tunnels used in this LSP are also detour tunnels.




A fully loose LSP "toR6" is configured. All links have the same cost and all routers are Alcatel- Lucent 7750 SRs. The LSP currently traverses the path R1-R2-R7-R8-R4-R6 and the resignal timer is enabled. Which of the following about this LSP is FALSE?

A. The LSP will switchover to another path if a failure occurs.B. The LSP will switchover to a better path as soon as it is available.C. CSPF must be enabled for this LSP to attempt to find a better path.D. The LSP will switchover to a better path in a MBB fashion.




An LDP tunnel is established on router R1 towards router R6. The link between routers R2 and R4 goes down. What will happen to the MPLS data traffic to routerR6 IMMEDIATELY after the link goes down?

A. MPLS data traffic will be discarded until the IGP finds a new next-hop to router R3.B. MPLS data traffic will be discarded unless the LDP tunnel has a standby secondary path.C. MPLS data traffic will not be discarded because router R1 received labels from both next- hops, routers R2 and R3.

D. MPLS data traffic will not be discarded because of fast reroute capability on router R2.


Explanation/Reference:ENU103-3rd

QUESTION 180Fill in the blanks: A ________device has all interfaces inside the provider domain, and a _______ device has at least one interface outside the provider domain.

A. PE, PB. P, PEC. PE, CED. CE, PEE. CE, P



QUESTION 181Consider a device that uses per-platform label space; which of the following fields is NOT contained in the LFIB?

A. Incoming labelB. Outgoing labelC. Incoming interfaceD. Outgoing interface



QUESTION 182Which of the following regarding MPLS encapsulation for VPRN services is TRUE?

A. The customer's Layer 3 header is removed at the iLER.B. The customer's Layer 2 header is removed at the iLER.C. The customer's Layer 3 header is removed at the eLER.D. The customer's Layer 2 header is removed at the eLER.



QUESTION 183Which of the following about the Link LDP discovery process on the Alcatel-Lucent 7750 SR is FALSE?

A. LDP Hello messages are sent over TCP.B. LDP Hello messages are sent to the All Routers address 224.0.0.2.C. LDP Hello messages are exchanged between all directly connected LDP enabled routers.D. Each LDP enabled router must have its own unique system IP address.



QUESTION 184Which of the following devices assumes the active role during the establishment of an LDP session?

A. The peer with the higher physical address.B. The peer with the higher transport address.C. The peer with the lower physical address.D. The peer with the lower transport address.

E. The peer that generated the first Hello message.



QUESTION 185Which of the following messages is NOT used in T-LDP operation?

A. Hello messageB. Init messageC. Keepalive messageD. Label Mapping messageE. ACK message





A. The router can reach prefix 192.10.1.2/32 through a RSVP-TE tunnel.B. The router can reach prefix 192.10.1.2/32 through an LDP tunnel.C. The router 10.10.10.2 is the egress router of the prefix 192.10.1.2/32.D. The Isp-ping tool is used to perform a unidirectional LSP test.



QUESTION 187Which of the following about LSP path configuration on an Alcatel-Lucent 7750 SR is TRUE?

A. The path must include at least one hop.B. The path may be used for multiple LSPs.C. The path may be used multiple times in a single LSP.D. The path must define a tunnel destination IP address.




RSVP session state for LSP 1 has timed out on router R3. Which of the following actions will router R3 initiate to clear the RSVP session?

A. Send a PATH Tear message toward router R6.B. Send a PATH Tear message toward router R1.C. Send a PATH Error message toward router R6.D. Send a PATH Error message toward router R1.



QUESTION 189Which of the following about CSPF is TRUE?

A. The tail-end router performs the CSPF calculation for an LSP.B. CSPF calculations are always performed on RSVP-TE based LSPs.C. The head-end router performs the CSPF calculation for an LSP.D. Each downstream router performs its own CSPF calculation for an LSP.



QUESTION 190Which of the following describes 6PE?

A. P routers run IPv4 only. PE routers run IPv4 only and exchange IPv6 routes using MP-BGP.B. P routers run IPv4 only. PE routers run both IPv4 and IPv6 and exchange IPv6 routes using MP-BGP.C. P routers run IPv6 only. PE routers run both IPv4 and IPv6 and exchange IPv4 routes using MP-BGP.D. P routers run IPv6 only. PE routers run IPv6 only and exchange IPv4 routes using MP-BGP.



QUESTION 191To enable the LDP-over-RSVP feature, which of the following configurations is NOT required on an Alcatel-Lucent 7750 SR?

A. Enable the Idp-over-rsvp feature on all PEs and ABRs along the LSP tunnel.B. Configure Link-LDP sessions between each PE-ABR and ABR-ABR pair.

C. Configure RSVP-TE LSPs in each area between each PE-ABR and ABR-ABR pair.D. Configure T-LDP sessions with the tunneling option.



QUESTION 192Which of the following is NOT required when configuring an LSP with an admin group constraint on an Alcatel-Lucent 7750 SR?

A. Enable traffic engineering on all routers along the LSP path.B. Enable CSPF on the head-end router.C. Configure a path definition on all routers along the LSP path.D. Enable MPLS and RSVP on all routers along the LSP path.




An LSP path is established on router R1 toward router R6. If there is a problem on router R4, but the link between R2 and R4 remains up, which of the following willaffect the failure detection time?

A. The time router R2 takes to receive a PATH Error message from router R4.B. The time router R2 takes to find out a number of RSVP Hello messages have been missed.C. The time router R2 takes to send a PATH Tear message to the head-end router.D. The time router R2 takes to receive a PATH message from router R4 after a PATH refresh interval.



QUESTION 194


If the primary path goes down, which secondary LSP path will the head-end router select first?

A. Secondary_Path-1B. Secondary_Path-2C. Secondary_Path-3D. Secondary_Path-4



QUESTION 195Facility fast reroute with node protection is enabled for an LSP, which of the following is FALSE?

A. Each PLR signals a bypass tunnel that avoids the next-hop downstream router.B. When a failure occurs, the PLR pushs an additional label onto the label stack.C. No bypass tunnel is established if the PLR cannot provide node protection.D. The head-end router sets the local protection desired flag in the session attribute object.




An LDP tunnel is established on R1-R2-R4-R6 because the link between routers R3 and R6 is down. With the LDP-IGP Sync feature enabled, what happensimmediately after the link is restored?

A. A new LDP session is established on R1-R3-R6 as soon as the FIB is updated.B. The LDP session remains unchanged until the existing path R1-R2-R4-R6 goes down.C. A new LDP session is established on R1-R3-R6 as soon as router R1 receives a new label for router R6.D. The LDP session remains unchanged until router R3 stops advertising the maximum metric for the link to router R6.




An LSP traverses R1-R2-R4-R6 and one-to-one fast reroute with link protection is enabled. All links have the same cost. Which of the following about DMP and MPis TRUE?

A. R3 and R5 become DMPs; R6 becomes MP.B. R3 and R5 become DMPs; R4 becomes MP.C. R3, R5, and R6 become DMPs; R4 becomes MP.D. R1, R3, and R5 becomes DMPs; R4 and R6 become MPs.


Explanation/Reference:ENU103-4th

QUESTION 198

Which of the following devices inspects the MPLS header in the received packet, and exchanges it for a new MPLS header?

A. iLERB. LERC. LSRD. PEE. eLER



QUESTION 199Which of the following defines an FEC in traditional IP?

A. A group of packets that will be forwarded by the router in the same manner, over the same path.B. A group of packets that arrive at the router on the same interface,C. A group of packets that leave the router on the same interface.D. A group of packets that arrive at the router on the same interface, from the same source.



QUESTION 200Which MPLS mode saves only active label mappings received from peer LSRs?

A. Conservative label retentionB. Liberal label retentionC. Downstream on demandD. Downstream unsolicited



QUESTION 201Which of the following about label modes on the Alcatel-Lucent 7750 SR is FALSE?

A. RSVP uses downstream on demand label distribution mode.B. LDP uses conservative label retention mode.C. LDP advertises label mappings to all peers for which it might be a next-hop for a given FEC.D. RSVP distributes a label mapping for a FEC when it has been requested to do so.




This policy is applied on a router as an LDP export policy and an LDP session has been established between this router and its neighboring router. In addition to theFECs learned from its neighbors, what additional FECs will appear in this router's LIB?

A. All FECs that are in the 192.168.1.0/24 address space.B. Local FECs that are in the 192.168.1.0/24 address space.C. All FECs that are not in the 192.168.1.0/24 address space.D. All FECs except the local FECs that are in the 192.168.1.0/24 address space.



QUESTION 203Which of the following about RSVP-TE is FALSE?

A. It supports traffic protection using IGP equal cost paths.

B. It supports CAC to prevent resource overbooking.C. It supports LSPs with traffic engineering constraints.D. It supports LSPs that follow the IGP best path.




LSP 1's link between routers R3 and R6 has failed, and the RESV state at router R3 has timed out. Which of the following actions will router R3 initiate?

A. Send a PathTear message towards router R6.

B. Send a PathTear message towards router R1.C. Send a ResvTear message toward router R6.D. Send a ResvTear message toward router R1.



QUESTION 205Click on the exhibit. After the Isp-ping command is executed, which of the following best describe the router's action?

A. MPLS Echo Request packets are sent within the RSVP-TE tunnel that is signaled for "lsp- toR2".B. MPLS Echo Request packets are sent within the LDP tunnel that is signaled for Mlsp-toR2".C. MPLS Echo Request packets are IP-routed to the destination address of "lsp-toR2".D. MPLS Echo Request packets are sent to the destination address of "lsp-toR2" over TCP.



QUESTION 206Which of the following about IS-IS Traffic Engineering on an Alcatel-Lucent 7750 SR is FALSE?

A. Traffic engineering information is carried in the extended TLVs.B. Traffic engineering must be enabled on all IP/MPLS routers along the LSP path.C. Traffic engineering information is stored in the opaque database,D. Traffic engineering is required for constraint-based LSPs.



QUESTION 207Which LSA type is used for OSPF-TE?

A. Type 8 LSA -- Link Local LSAB. Type 9 LSA -- Link local Opaque LSAC. Type 10 LSA -- Area local Opaque LSAD. Type 11 LSA --AS Opaque LSA



QUESTION 208Which of the following regarding label population is TRUE?

A. Selected labels from the FIB are populated to the LFIB.B. Selected labels from the RIB are populated to the FIB.C. Selected labels from the LIB are populated to the FIB.D. Selected labels from the LIB are populated to the LFIB.



QUESTION 209Which of the following is NOT an application of MPLS?

A. Enabling VPNsB. Enabling traffic engineeringC. Enabling network securityD. Enhancing network resiliency



QUESTION 210Which of the following fields does NOT appear in the MPLS label header?

A. LabelB. Frame check sequenceC. Traffic Class (previously called Experimental)D. Time To liveE. Bottom of stack bit




What is the possible reason that the label for prefix 192.10.1.2/32 is not active?

A. The router does not have a route to reach to the peer 10.10.10.2/32.B. The router does not have a route to reach to the prefix 192.10.1.2/32.C. The router does not have an export policy defined to export the prefix 192.10.1.2/32 into LDP.D. The router receives an invalid label for the prefix 192.10.1.2/32 from its peer.


Explanation


QUESTION 212Which of the following about RSVP-TE summary refresh messages is TRUE?

A. They list the RSVP session names that the router is refreshing,B. They list the Message IDs that the router is refreshing,C. They list the Tunnel IDs that the router is refreshing.D. They list the LSP I Ds that the router is refreshing.



QUESTION 213If an LSP needs to use an admin group, which of the following configurations is NOT required on the Alcatel-Lucent 7750 SR?

A. Assign an admin group to a MPLS interface.B. Configure CSPF on the LSP.C. Configure at least one strict hop on the LSP path.D. Configure an "include" or "exclude" statement on the LSP path.




The partial command output from an Alcatel-Lucent 7750 SR is shown. Which of the following about this LSP path is TRUE?

A. R4 (10.10.10.4) has established a link protection tunnel.B. R6 (10.10.10.6) has established a link protection tunnel.C. R2 (10.10.10.2) has established a node protection tunnel.D. R1 (10.10.10.1) has not established a node protection tunnel.



QUESTION 215Which of the following regarding the location of an MPLS label is FALSE?

A. The MPLS label value may be carried in an ATM header.B. The MPLS label value may be carried in a shim header.C. The MPLS label value may be carried in an OSPF header.D. The MPLS label value may be carried in a Frame Relay header.



QUESTION 216An IS-IS TE enabled router has an interface on a 500Mbps link and it is configured with a 25% subscription. If this interface is not used by any LSPs. what value willbe shown in the Reservable Bandwidth sub-TLV?

A. 125 MbpsB. 500 MbpsC. 625 MbpsD. 2000 Mbps




The LSP "toR6" is configured with a fully strict path on an Alcatel-Lucent 7750 SR. Which of the following configurations is required to enable fast reroute for thisLSP?

A. Enable fast-reroute on all routers along the path. R1, R2, R4, and R6.B. Enable both link-protection and node-protection on router R1.C. Enable fast-reroute with either one-to-one or facility mode on this LSP.D. Enable link-protection only on router R4.



QUESTION 218Which MPLS label mode saves label mappings received from all peer LSRs?

A. Conservative label retentionB. Liberal label retentionC. Downstream on demandD. Downstream unsolicited




An LDP-over-RSVP tunnel is established between PE-1 and PE-2. Which of the following is NOT required to protect the LDP-over-RSVP tunnel?

A. PE-1 requires T-LDP sessions to both ABR-1 and ABR-2.B. PE-1 requires a full mesh of RSVP-TE LSPs to all routers in area 1.C. ABR-1 requires T-LDP sessions to all ABRs in area 0.D. PE-1 requires fast reroute enabled on all RSVP-TE LSPs.



QUESTION 220You wish to advertise LDP labels for all local networks; which is the most effective policy statement to use?

A. from prefix-list directB. match localC. from protocol directD. match protocol directE. from protocol local



QUESTION 221Which of the following indicates the path over which an LSP's tail end router will return an RSVP RESV message?

A. The IGP FIB.B. The Reservation State Block (RSB)C. The Path State Block (PSB)D. The opaque database.




With fast reroute enabled, and given the following:Two protected LSPs with the path R1-R2-R3Both LSPs enable facility bypass and link protection.

When router R1 is the PLR, which router becomes the MP?



Explanation/Reference:valid and updated.


Given the output below, which of the following statements are true? (Choose three)

A. A packet arriving with label 131066 and destined for prefix 10.10.10.243/32 will be forwarded out interface 1/1/4, with label 131070.B. LDP ECMP is enabled.C. The router's system address is 10.10.10.242/32.

D. There are multiple LSPs to reach FEC 10.10.10.244/32.E. The router cannot receive any unlabeled packets destined for prefix 10.10.10 223/32.



QUESTION 224Which of the following statements best describe MPLS fast reroute characteristics? (Choose two)

A. Fast reroute requires you to manually define detour paths.B. Fast reroute provides path protection close to the failure pointC. Fast reroute performs automatic path calculation and signaling.D. Fast reroute protects both primary and secondary paths.



QUESTION 225During node protection signaling, the PLR knows the address of the MP from which of the following methods?

A. The PLR issues a RSVP path message to the destination router to request the address of the MP.B. The PLR learns the address of the MP from the ERO.C. The PLR learns the address of the MP from the RROD. The PLR learns the address of the MP from the targeted RSVP hello message.E. The PLR does not need to know the address of the MP.



QUESTION 226What is the significance of receiving a packet with the bottom MPLS label S bit set to 1?

A. It results in forwarding based on the next packet header.B. It indicates that the label is the bottom of the MPLS label stack.C. It indicates that the label is the top of the MPLS label stack.D. Any LSR that receives an S bit set to 1 must discard the packet.



QUESTION 227Which command can be used to verify the LDP settings for label distribution and retention?

A. show router ldp defaultB. show router ldp parametersC. show router ldp settingsD. show router mpls settingsE. show router mpls label-options



QUESTION 228Router R3 signals an LSP, reserving 1Gbps bandwidth on a 10Gbps link. RSVP configuration limits reservable bandwidth to 20 percent on the egress interface.Which of the following statements is true?

A. The egress RSVP interface has 80 percent bandwidth unreserved.B. LSPs can reserve an additional 9.9 Gbps bandwidth on this RSVP interface.

C. The head end reserves 100Mbps for the LSPD. The egress RSVP interface has 1 Gbps bandwidth unreserved.




Assuming that LSP R1-R2-R3 requests the default fast reroute configuration, which router becomes a DMP for the detour tunnels?


Correct Answer: E



QUESTION 230Which of the following message types does RSVP use to set up an LSP? (Choose two)

A. Path messageB. iLER messageC. Resv messageD. LSP setup call requestE. eLER message



QUESTION 231Assume that, on the Alcatel-Lucent 7750 SR, an LSP is configured with one-to-one FRR and node protection. Which of the following statements are FALSE?(Choose two)

A. Each PLR signals a detour LSP that avoids the downstream node. If the downstream node cannot be avoided, a detour LSP that avoids the downstream link issignaled.

B. The detour LSP can take one or more hops before merging back on the protected LSP.C. The merge point of the protected LSP must be the next-next-hop nodeD. The ingress router will set the local protection desired flag in the session attribute object of the path message to inform all routers along the protected LSP path

to establish detour LSPs.E. The label recording desired flag must be set in the session attribute object in order for the PLR to know what label to swap when using the detour LSP.

Correct Answer: CESection: (none)Explanation



With fast reroute enabled, and given the following:The protected LSP path is R1-R2-R3.All links are of equal cost.Which of the following statements is true? (Choose two)

A. Router R1 is the LSP originator and is also a PLR.B. With one-to-one link or node protection, the detour LSP path is R1-R4-R5-R2-R3.C. With one-to-one link or node protection, the detour LSP path is R1-R4-R5-R3.D. If the R2-R3 link fails, router R3 becomes a PLRE. None of the nodes can be protected with FRR.



QUESTION 233Which of the following statements regarding LSP path configuration are true? (Choose three)

A. The path must include at least one hop.

B. The path may be used multiple times in a single LSP.C. The path may comprise loose hop entries only.D. The path must define the LSP's tail end.E. The path may be used for multiple LSPs.

Correct Answer: CESection: (none)Explanation



Consider the following:

Routers R1 and R4 are in Area 1.Routers R4 and R5 in Area 0.Routers R5 and R3 are in Area 2.

To support LDP-over-RSVP tunnels between routers R1 and R3 over path R1-R4-R5-R3, with which routers will router R5 require targeted sessions? (Choose two)

A. Router R1B. Router R4C. Router R2D. Router R3

Correct Answer: BDSection: (none)Explanation


QUESTION 235Which of the following statements best describes downstream unsolicited label distribution?

A. An LER may answer requests for label mappings immediately, without waiting for a label mapping from the next-hop.B. An LER may advertise label mappings to all peers for which it might be a next-hop for a given FEC.C. An LER propagates a label mapping downstream for a FEC. only if it has a label mapping for the FEC next-hop.D. An LER will only distribute a label for a FEC when it has been requested to do so.



QUESTION 236In MPLS, labels are distributed in the opposite direction of the data flow.

A. TRUEB. FALSE




Given the configuration below, what is the system ID of the destination node?

A. 10.32.1.2B. 10.1.478C. 1048.1.1D. Cannot tell from this configurationE. 10.1.2.2

Correct Answer: B



QUESTION 238Which of the following is defined by the following statement? All label mappings received from all peer LSRs are saved.

A. Conservative label retentionB. Liberal label retention.C. Downstream on demand.D. Downstream unsolicited.



QUESTION 239What is the common usage of the MPLS EXP bits?

A. Each implementation can use them as they see fit.B. They are used to carry the Ethertype value.C. They are used to carry the TTL value.D. They are used to carry QoS classification.E. They are used to carry fragmentation flag information



QUESTION 240If an LSP's loose primary path includes the statement "include green" and "exclude red;" how does CSPF choose the LSP's path?

A. CSPF chooses a link that is a member of both administrative groupsB. CSPF chooses only those links that are NOT members of the green admin groupC. CSPF prunes the green links and uses these links for the secondary pathD. CSPF signals the LSP path over the green links only, and prunes all other links




Given the configuration below, which of the following scenarios is FALSE?

A. Both the primary and secondary paths are explicitly defined.B. The primary path is active and the secondary path is in hot standby.C. The LSP defined will use the primary path and will signal the secondary path to become active if the primary path fails.D. The LSP has the same source and destination for both primary and secondary paths.



QUESTION 242Which of the following commands may only be used on the head end router to verify the status of an LSP named "LSP 1"? (Choose two)

A. show router mpls Isp "LSP 1" originateB. show router mpls Isp "LSP 1" path detailC. show router rsvp session originateD. show router rsvp session "LSP 1"



QUESTION 243Which of the following are the default settings for the Alcatel-Lucent 7750 SR when using LDP?

A. Ordered control mode; downstream on demand.B. Ordered control mode; downstream unsolicited.C. Independent control mode; downstream on demand.D. Independent control mode; downstream unsolicited.


Explanation


QUESTION 244Which default LDP parameter are you able to change with CLI?

A. Label space modeB. Label retentionC. Control modeD. Keepalive factor



QUESTION 245Which of the following are characteristics of an LSP? (Choose two)

A. It is unidirectional.B. It is bidirectional.C. It must always have a secondary path.D. It provides a specific tunnel for a FEC through the network.E. It always follows the IGP best path.



QUESTION 246In MPLS, at which device are packets assigned to a FEC?

A. LSRB. LERC. eLERD. iLERE. CE



QUESTION 247When configuring an LSP for fast reroute one-to-one protection, which of the following statements is true?

A. The LSP can also use facility backup.B. The LSP is limited to node protection.C. You cannot request bandwidth on the protected LSP.D. Node protection can be disabled.



QUESTION 248Which of the following are functions of the MPLS control plane in a router? (Choose two)

A. Label allocation and management.B. Label swapping.C. Pushing a label on an unlabeled packet.D. Label signaling.E. Routing lookups.

Correct Answer: AD



QUESTION 249Which of the following statements regarding RSVP refresh reduction are true1? (Choose two)

A. Message-IDs replace individual refresh messages.B. Refresh reduction applies only to reservation messages.C. RSVP generates a summary-refresh message for each LSP.D. An LSP state change causes an incremented Message-ID.


Explanation/Reference:updated.


alcatel-lucent.testking.4a0-103.v2015-03-12.by.bradley...alcatel-lucent multi protocol label...

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