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CCNA Implementation SIMOctober 22nd, 2010 Go to comments

This topology contains 3 routers and 1 switch. Complete the topology.

Drag the appropriate device icons to the labeled DeviceDrag the appropriate connections to the locations labeled Connections.Drag the appropriate IP addresses to the locations labeled IP address

(Hint: use the given host addresses and Main router information)To remove a device or connection, drag it away from the topology.

Use information gathered from the Main router to complete the configuration of any additional routers. Nopasswords are required to access the Main router. The config terminal command has been disabled for the HQ router.The router does not require any configuration.

Configure each additional router with the following:

Configure the interfaces with the correct IP address and enable the interfaces.Set the password to allow console access to consolepwSet the password to allow telnet access to telnetpwSet the password to allow privilege mode access to privpw

Note: Because routes are not being added to the configurations, you will not be able to ping through theinternetwork.All devices have cable autosensing capabilities disabled.All hosts are PC’s

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Answer and explanation:

Specify appropriate devices and drag them on the “Device” boxes

For the device at the bottom-right box, we notice that it has 2 interfaces Fa0/2 and Fa0/4; moreover the link connects thePC on the right with the device on the bottom-right is a straight-through link -> it is a switch

The question stated that this topology contains 3 routers and 1 switch -> two other devices are routers

Place them on appropriate locations as following:

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(Host D and host E will be automatically added after placing two routers. Click on them to access neighboring routers)

Specify appropriate connections between these devices:

+ The router on the left is connected with the Main router through FastEthernet interfaces: use a crossover cable+ The router on the right is connected with the Main router through Serial interfaces: use a serial cable+ The router on the right and the Switch: use a straight-through cable+ The router on the left and the computer: use a crossover cable

(To remember which type of cable you should use, follow these tips:

- To connect two serial interfaces of 2 routers we use serial cable– To specify when we use crossover cable or straight-through cable, we should remember:Group 1: Router, Host, ServerGroup 2: Hub, SwitchOne device in group 1 + One device in group 2: use straight-through cableTwo devices in the same group: use crossover cable

For example: we use straight-through cable to connect switch to router, switch to host, hub to host, hub to server… andwe use crossover cable to connect switch to switch, switch to hub, router to router, host to host… )



Assign appropriate IP addresses for interfaces:

From Main router, use show running-config command:

(Notice that you may see different IP addresses in the real CCNA exam, the ones shown above are just used fordemonstration)

From the output we learned that the ip address of Fa0/0 interface of the Main router is 192.168.152.177/28. This addressbelongs to a subnetwork which has:

Increment: 16 (/28 = 255.255.255.240 or 1111 1111.1111 1111.1111 1111.1111 0000)Network address: 192.168.152.176 (because 176 = 16 * 11 and 176 < 177)Broadcast address: 192.168.152.191 (because 191 = 176 + 16 – 1)

And we can pick up an ip address from the list that belongs to this subnetwork: 192.168.152.190 and assign it to theFa0/0 interface the router on the left

Use the same method for interface Serial0/0 with an ip address of 192.168.152.161

Increment: 16Network address: 192.168.152.160 (because 160 = 16 * 10 and 160 < 161)Broadcast address: 192.168.152.175 (because 176 = 160 + 16 – 1)

-> and we choose 192.168.152.174 for Serial0/0 interface of the router on the right

Interface Fa0/1 of the router on the left

IP (of the computer on the left) : 192.168.152.129/28


-> we choose 192.168.152.142 from the list

Interface Fa0/0 of the router on the right

IP (of the computer on the left) : 192.168.152.225/28




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-> we choose 192.168.152.238 from the list

Let’s have a look at the picture below to summarize

Configure two routers on the left and right with these commands:

Router1 = router on the left

Assign appropriate IP addresses to Fa0/0 & Fa0/1 interfaces:

Router1>enableRouter1#configure terminalRouter1(config)#interface fa0/0Router1(config-if)#ip address 192.168.152.190 255.255.255.240Router1(config-if)#no shutdown

Router1(config-if)#interface fa0/1Router1(config-if)#ip address 192.168.152.142 255.255.255.240Router1(config-if)#no shutdown

Set passwords (configure on two routers)

+ Console password:

Router1(config-if)#exitRouter1(config)#line console 0Router1(config-line)#password consolepw



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Router1(config-line)#loginRouter1(config-line)#exit

+ Telnet password:

Router1(config)#line vty 0 4Router1(config-line)#password telnetpwRouter1(config-line)#loginRouter1(config-line)#exit

+ Privilege mode password:

Router1(config)#enable password privpw

Save the configuration:

Router1(config)#exitRouter1#copy running-config startup-config

Configure IP addresses of Router2 (router on the right)

Router2>enableRouter2#configure terminalRouter2(config)#interface fa0/0Router2(config-if)#ip address 192.168.152.238 255.255.255.240Router2(config-if)#no shutdown

Router2(config-if)#interface serial0/0Router2(config-if)#ip address 192.168.152.174 255.255.255.240Router2(config-if)#no shutdown

and set console, telnet and privilege mode passwords for Router2 as we did for Router1, remember to save theconfiguration when you finished

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Comments

1. BrianDecember 2nd, 2010

I have 2 questions for this lab.1. After you have setup the IP addresses for ports connected to Main router does it matter what IP addresses youuse for ports connected to the switches and pcs? And at that point does it matter which IP address you assign toeach PC? It seems as long as you eliminate the IP addresses that are in the hosts range of the Main router, you canput the rest of the IP addresses anywhere you want.

2. Do you set the passwords on the “Main” router as well??

2. ciscoDecember 2nd, 2010

Guys .. the question says :Configure the interfaces with the correct IP address and enable the interfaces.

is that means we have to configure the 2 other interfaces facing the switch and the PC ?

3. 9tutDecember 2nd, 2010

@Brian:1. In the exam, you can only assign one IP address for one interface and surely each port will only have one suitableIP address for it.2. No, just set the passwords on Router1 and Router2

@cisco: Yes, we have to configure interfaces Fa0/0, Fa0/1 of Router1 and S0/0, Fa0/0 of Router2

4. AroshaDecember 10th, 2010

I just donn’t understand why have you issued

Router1(config)#enable password privpw

instead of

Router1(config)#enable secret privpw

can you please explain

5. alDecember 12th, 2010

On router1, how did you figure out what interface# is connected to the Main Router and what interface # to thehost? In other words, how you found out that fa0/0 must be assigned 192.168.152.190 for example… Thanks!



6. UthmanHassanDecember 13th, 2010

@ Arosha

I just donn’t understand why have you issuedRouter1(config)#enable password privpwinstead ofRouter1(config)#enable secret privpwcan you please explain

——————————

Perhaps because the question stated:Set the password to allow privilege mode access to privpw

Instead of:Set the secret to allow privilege mode access to privpw

7. UthmanHassanDecember 13th, 2010

@ al

On router1, how did you figure out what interface# is connected to the Main Router and what interface # to thehost? In other words, how you found out that fa0/0 must be assigned 192.168.152.190 for example… Thanks!

————————————————–

You have access to the Main Router’s config. Find out the fa0/0 on the Main router. The IP address of fa0/0interface of attaching router must be from the same subnet.

fa0/0 of Main router is:192.168.152.177255.255.255.240

network block size is 256-240=16 in last octet. Counting networks from subnet 0, 192.168.152.177 belongs to thesubnet 192.168.152.176 – 192.168.152.191.

What other address from this range is given as an option for the interface fa0/0 of neighbor router? Answer:192.168.152.190/28

8. dipankar duttaDecember 17th, 2010

Pls upload the new dumps of dec 2010

9. XORDecember 23rd, 2010

how come you are connecting host A with the Router with crossover cable, is not should be Rolledover ?

10. atul



December 26th, 2010

Network address: 192.168.152.176 (because 176 = 16 * 11 and 176 < 177 .. did not understood this have examdue in tue .. any one can explain … thanx in advance……

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