jn0-662.juniper · 7/4/2018 · the bgp session is up, but ipv4 hosts in the layer 3 vpn that use...

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JN0-662.juniper

Number: JN0-662Passing Score: 800Time Limit: 120 min



Exam A

QUESTION 1Click the Exhibit button.

You have configured a BGP-signaled Layer 2 VPN with the configuration shown in the exhibit.

Which two statements are true in this situation? (Choose two.)



A. Remote site 1 is dual-homed.

B. The local site is site ID 1.

C. The route-distinguisher is in the wrong format.

D. Interface ge-0/0/l.512 is connected to the local site

Correct Answer: ABSection: (none)Explanation

Explanation/Reference:Reference: https://www.juniper.net/documentation/en_US/junos/topics/usage-guidelines/vpns-configuring-routing-instances-on-pe-routers-in-vpns.html#id-10110155

QUESTION 2After committing the following configuration change on your MPLS VPN PE router, all MPLS VPN destinations become unreachable.

Which additional configuration solves the issue?

A.

B.


C.

D.

Correct Answer: CSection: (none)Explanation

Explanation/Reference:



You have configured Layer 2 VPN stitching between two Layer 2 circuits on PE2, but traffic is not passing through the VPN.

Referring to the exhibit, what is the problem?

A. The unit 1 peer unit must be set to 0.

B. The VLAN IDs must be lower than 512.

C. The VLAN IDs must be different on each unit.

D. The peer units must reference the VLAN IDs.

Correct Answer: ASection: (none)Explanation


QUESTION 4You want to add a new OSPF area to your existing OSPF network, however, this area will not be directly connected to Area 0. Which feature would you use tocomplete this task?

A. a routing policy

B. not-so stubby area


C. virtual link

D. Type 10 LSA





Referring to the exhibit, which statement is correct?

A. IP address 192.168.16.5 is on a directly connected interface.

B. Four routes have been leaked from the Level 2 area to the Level 1 area.

C. The path to IP address 192.168.16.6 is currently unavailable.

D. R1 has two Level 2 adjacencies and one Level 1 adjacency to other routers.




Referring to the exhibit, what must be added to the existing configuration to ensure that per-prefix load balancing occurs?



A. multihop

B. keep all

C. multipath

D. family inet unicast



QUESTION 7Which statement is correct regarding BGP route reflectors?

A. The route reflectors must have a private AS number.

B. The route reflectors must have an EBGP peering session between each other.

C. The route reflectors must have a cluster ID configured.

D. The route reflectors must have a different AS number than the clients.


Explanation/Reference:Reference: https://www.juniper.net/documentation/en_US/release-independent/nce/topics/example/routing-protocol-bgp-security-route-reflector-configuring-cli.html

QUESTION 8You want to use IS-IS on a GRE interface where the underlying Layer 3 MTU is 1500.

Which statement is correct in this scenario?


A. IS-IS can be used because every IS-IS interface must be capable of transmitting packets at least as large as 1476 bytes, and the GRE header is 24 bytes.

B. IS IS can be used, but the networking device directly attached to the circuit must be capable of fragmentation.

C. IS-IS cannot be used, but the router can enable a GRE key that serves the same function as IS-IS.

D. IS-IS cannot be used because the IS-IS hello is not allowed to be fragmented and has the DF bit set.

Correct Answer: BSection: (none)Explanation

Explanation/Reference:Reference: https://kb.juniper.net/InfoCenter/index?page=content&id=KB7848


Referring to the exhibit, when building an interprovider VPN Option C between AS65100 and AS65200, which two parameters must be configured on the EBGPconnection between PE1 and PE2? (Choose two.)

A. family inet-vpn unicast

B. multihop

C. family inet labeled-unicast

D. multipath

Correct Answer: AB


Section: (none)Explanation

Explanation/Reference:Reference: https://www.juniper.net/documentation/en_US/junos/topics/example/mpls-vpn-option3-configuration.html#jd0e200


You administer AS 65000, and have deployed a route reflector (RR1) in your network as shown in the exhibit. The traffic between AS 65001 and AS 65002 is goingthrough the route reflector, even though it is not the best path.


What will solve this problem?

A. Change the LOCAL_PREF so that it uses the preferred path.

B. Remove the nhs policy.

C. Change the originator to be the preferred path.

D. Change the IGP metric so it is lower on the preferred path.



QUESTION 11You are asked to deploy VPLS in your network as a new service for several customers, and you must identity the configuration and provisioning requirements foryour customers. Which two statements are correct in this scenario? (Choose two.)

A. CE interfaces facing the service prowler must be Ethernet interfaces.


B. VLAN IDs defined on CE interfaces must be the same on both ends unless otherwise negotiated.

C. CE interfaces facing the service provider must be Layer 3 interfaces.

D. PE interfaces facing the core must have VPLS encapsulation enabled.





While logging in to routers on your network, you find the exact configuration shown in the exhibit on multiple devices.

Which multicast RP strategy is being used in this scenario?

A. embedded-rp

B. auto-rp

C. bsr

D. anycast-rp

Correct Answer: DSection: (none)Explanation


QUESTION 13Which message type initiates the BGP session?

A. update

B. open

C. keepalive

D. notification



Explanation/Reference:Reference: https://www.juniper.net/documentation/en_US/junos/topics/concept/bgp-routing-messages-overview.html



The exhibit shows a BGP peering session for two PE routers. The BGP session is up, but IPv4 hosts in the Layer 3 VPN that use the BGP session are unable tocommunicate.

What is the problem?

A. The BGP peer does not support the add-path feature.

B. The BGP peer does not support the restarter functionality.

C. The local BGP router does not support Layer 2 VPN and Layer 3 VPN NLRI address families at the same time.

D. There is a mismatch in the supported NLRI address families between the BGP peers.



QUESTION 15Which two LSA types are permitted in an OSPF stub area? (Choose two.)

A. Type 1

B. Type 2

C. Type 4

D. Type 5


Explanation/Reference:Explanation:Stub areas can contain type 1, 2, and 3 LSAs. A default route is substituted for external routes.

QUESTION 16Which two routes use a proper route distinguisher? (Choose two.)

A. 192.168.0.1:12:10.1.0.0/16

B. 12345:12:10.1.0.0/16


C. 192.168.0.1:10.1.0.0:12/16

D. 12345:10.1.0.0:12/16



QUESTION 17Which neighbor state indicates that two BGP neighbors have full connectivity?

A. Idle

B. Connect

C. OpenConfirm

D. Established





Which two statements are true about the route shown in the exhibit? (Choose two.)

A. The route is currently active.

B. The route is currently hidden.


C. The route has an unreachable next-hop.

D. The route is currently being damped.





The route shown in the exhibit is being advertised to the EBGP peer and displays a next hop of itself. However, you do not have a next-hop self policy configured.What would cause this behavior?

A. The IBGP peers have a next-hop self policy, which the router is exporting to the EBGP neighbors.


B. The set protocols bgp path-selection as-path-ignore is not set and must be added so the next-hop attribute will propagate from the peer.

C. The set protocols bgp accept-remote-next hop is not set and must be added so the next-hop attribute will propagate from the peer.

D. The next-hop attribute was modified by default when it was advertised to the EBGP peer, without applying a policy.




Referring to the exhibit, you want to ensure that routers in Area 20 can connect to routers in Area 0.

Which two steps must be done to allow this behavior? (Choose two.)

A. A virtual link must be configured under R2 Area 0 and R4 Area 0.

B. Area 10 must be configured as a stub area.

C. A virtual link must be configured under R2 Area 0 and R4 Area 20.


D. Area 10 must be configured as a standard area.

Correct Answer: ADSection: (none)Explanation


QUESTION 21Which two statements are correct regarding site IDs and circuit IDs in a VPLS routing instance? (Choose two.)

A. In an LDP VPLS routing instance, vpls-id parameters must be different in each location.

B. In an LDP VPLS routing instance, the vpls-id parameters must match in all locations.

C. In a BGP VPLS routing instance, the site-id parameters must be different in each location.

D. In a BGP VPLS routing instance, the site-id parameters must match in all locations.

Correct Answer: BCSection: (none)Explanation




Referring to the exhibit, why are R1 and R2 not exchanging routes between their VPNs?

A. The route targets are not property configured.

B. The IP addresses in the BGP configuration must be in the same subnet.

C. The interfaces unit numbers must be the same on both sides.

D. The route distinguishers are not properly configured.





You have configured the OSPF network as shown in the exhibit. However, R4 and R5 do not have connectivity to prefixes outside of Area 10. In this scenario, whatwill solve this problem?

A. Configure default-metric on R2 and R3 for Area 10.

B. Configure no-summaries on R4 for Area 10.

C. Create a routing policy on R2 and R3 to redistribute Area 0 routes.

D. Configure the R2-R4 and R3-R4 links as interface-type p2mp.



Explanation/Reference:Reference: https://www.juniper.net/documentation/en_US/junos/topics/topic-map/ospf-stub-and-not-so-stubby-areas.html


What are two reasons for the message shown in the exhibit? (Choose two.)

A. The adjacency is failing because of a misconfigured attribute.

B. The adjacency is failing because of a faulty TCP connection.

C. The adjacency is failing because of a misconfigured address.

D. The adjacency is failing because of an authentication mismatch.



QUESTION 25You are configuring a BGP-signaled Layer 2 VPN service.

Which two statements are true in this scenario? (Choose two.)

A. RSVP-signaled LSPs are required.

B. The family 12vpn auto-discovery-only parameter is required for BGP sessions.

C. The family 12vpn signaling parameter is required for BGP sessions.

D. RSVP-signaled or LDP-signaled LSPs may be used.

Correct Answer: CDSection: (none)Explanation


Explanation/Reference:Reference: https://www.juniper.net/documentation/en_US/junos/topics/example/mpls-ex-series-vpn-layer2.html

QUESTION 26You are troubleshooting a Layer 3 VPN issue. The VPN has been passing traffic successfully for some time, but now it is reported that traffic is no longer flowing.You look into the bgp.l3vpn.0 table and see newly hidden routes.

What would be the cause of this problem?

A. The LSP used to connect the PE routers is down.

B. The connection from the PE to the customer is down.

C. The BGP routes received from the customer are no longer reachable.

D. The family inet-vpn parameter was deleted from the BGP configuration of the PE router.





Referring to the exhibit, what is the correct prefix length of the route for the multihomed device?

A. 192

B. 304

C. 296

D. 248


Explanation/Reference:Reference: https://www.juniper.net/documentation/en_US/junos/topics/concept/evpn-bgp-multihoming-overview.html

QUESTION 28


Click the Exhibit button.

Referring to the exhibit, which two statements are true? (Choose two.)

A. A BGP full mesh is only required between PE-1 and PE-2.

B. A BGP full mesh is required between P1, P2, PE-1, and PE-2.

C. MPLS must only be enabled on PE-1 and PE-2.

D. MPLS must be enabled on P1, P2, PE-1, and PE-2.

Correct Answer: ADSection: (none)Explanation




Referring to the exhibit, you have multiple Layer 3 VPNs established in your network. You are asked to ensure that PE-4 allows CE-2 in VPN 1 to communicate withCE-1 in VPN 3.

Which two statements are correct in this scenario? (Choose two.)


A. Use a BGP export policy to share the appropriate VRF routes.

B. Use the auto-export feature to share the appropriate VRF routes.

C. Use a BGP import policy to share the appropriate VRF routes.

D. Use rib-groups to share the appropriate VRF routes.


Correct Answer: ACSection: (none)Explanation


QUESTION 30How is a BGP Layer 2 VPN prefix formed by a PE?

A. by combining the route distinguisher and vrf-target, in that order

B. by combining the route distinguisher, remote site identifier, and site identifier, in that order

C. by combining the route distinguisher, site identifier, and remote site identifier, in that order

D. by combining the vrf-target and route distinguisher, in that order





Referring to the ABR configuration shown in the exhibit, which two statements are correct? (Choose two.)

A. The ABR advertises a default route to the NSSA with a metric of 10.

B. To reach the ABR, routers within the NSSA add 10 to their calculated path cost.

C. The ABR advertises NSSA routes to the backbone area with a metric of 10.

D. To reach the ABR, routers within the NSSA use the metric 10 as their path cost.


Explanation/Reference:Explanation:You must explicitly configure the ABR to generate a default route when attached to a stub or not-so-stubby-area (NSSA). To inject a default route with a specifiedmetric value into the area, you must configure the default-metric option and specify a metric value.Reference: https://www.juniper.net/documentation/en_US/junos/topics/topic-map/ospf-stub-and-not-so-stubby-areas.html

QUESTION 32You want to reject routes from any BGP peers that have prepended their AS path.

What is the correct as-path regex that would allow you to accomplish this task?

A. 65001.*

B. .{2,}

C. (65001|65001|65001)

D. .{0,1}





What is accomplished by the default-gateway parameter in the configuration shown in the exhibit?

A. The device creates a default route and distributes the IP address to all peers.

B. The device sends the MAC and IP addresses of the IRB interface to its peers.

C. The device sends the IP address of the IRB interface without the MAC address.

D. The device creates a default route and distributes its MAC and IP address to all peers.



QUESTION 34To reduce the size of OSPF Area 100, you configure the area with the no-summaries parameter. After committing this configuration change, you notice that anOSPF router in a remote area is no longer receiving Type 5 LSAs from an ASBR in Area 100.

Which statement is true in this scenario?

A. The ASBR in Area 100 generates Type 5 LSAs, and places them in its own database.

B. The ASBR in Area 100 generates Type 5 LSAs, and they are translated to Type 7 LSAs.


C. The ASBR in Area 100 generates Type 5 LSAs, and they are blocked by the ABR.

D. The ASBR in Area 100 generates Type 5 LSAs, and a virtual link is required for transport to other areas.





You have deployed route reflectors in your network. You are receiving the route 200.0.0.0/24 from AS10 and AS6 and are seeing the oscillation happening asshown in the exhibit.

What are two ways to solve this issue? (Choose two.)

A. Configure the always-compare-med parameter on both route reflectors.

B. Configure the add-path parameter on both route reflectors.

C. Configure the med-plus-igp parameter on both route reflectors.

D. Configure the as-path-ignore parameter on both route reflectors.


Explanation/Reference:Reference: https://www.juniper.net/documentation/en_US/junos/topics/concept/bgp-med-understanding.html

QUESTION 36How does Juniper Networks use selective BGP route damping to help stabilize the network?

A. The damping decay half-life holds down peer links for a defined measure of time to prevent route table reconvergence.

B. The damping max-suppress timer is set to the lowest possible value by default.

C. The figure-of-merit value measures route stability by advertisement and withdrawal.

D. Aggressive IGP hold timers prevent the routes from entering and exiting the BGP route selection process.



QUESTION 37Which two protocols are available in the Junos OS for the data plane encapsulation of EVPN traffic? (Choose two.)

A. MPLS

B. IPsec

C. VXLAN


D. GRE




Referring to the exhibit, what information must be acquired about AS65200's configuration for AS65100 to build an interprovider VPN between PE1 to PE2?

A. the route-distinguisher of PE2 and the loopback of PE2

B. the route-distinguisher of PE2 and the loopback of ASBR2

C. the route-target used for CE-A2 and the loopback of PE2

D. the route-target used for CE-A2 and the loopback of ASBR2



jn0-662.juniper · 7/4/2018 · the bgp session is up, but ipv4 hosts in the layer 3 vpn that use...

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