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OSPF Sim

June 23rd, 2011 in LabSim Go to comments

Question

9tut.net company has decided to network three locations to improve efficiency in inventory control. The routers have been named to reflect the location: Boston, Frankfurt, Lancaster.

OSPFSim

The necessary networking has been completed at each location, and the routers have been configured with single area OSPF as the routing protocol. The Boston router was recently installed but connectivity is not complete because of incomplete routing tables. Identify and correct any problem you see in the configuration.

Note: The OSPF process must be configured to allow interfaces in specific subnets to participate in the routing process.

You can download this lab and open with Packet Tracer here: http://www.9tut.net/download/OSPF_Sim_with_Solution.zip. Please say thanks to Renan who shared the files with us!

Answer and Explanation:

The question mentioned Boston router was not configured correctly or incomplete so we should check this router first. Click on PC-B to access the command line interface (CLI) of Boston router.

 

Boston>enable (type cisco as its password here)

Boston#show running-config

 

OSPF_sim_show_run

First, remember that the current OSPF Process ID is 2 because we will need it for later configuration. Next notice that in the second “network” command the network and wildcard mask are 192.168.155.0 and 0.0.0.3 which is equivalent to 192.168.155.0 255.255.255.252 in term of subnet mask. Therefore this subnetwork’s range is from 192.168.155.0 to 192.168.155.3 but the ip address of s0/0 interface of Boston router is 192.168.155.5 which don’t belong to this range -> this is the reason why OSPF did not recognize s0 interface of Boston router as a part of area 0. So we need to find a subnetwork that s0 interface belongs to.

IP address of S0 interface: 192.168.155.5/30

Subnet mask: /30 = 1111 1111.1111 1111.1111 1111.1111 1100

Increment: 4

Network address (which IP address of s0 interface belongs to): 192.168.155.4 (because 4 * 1 = 4 < 5)

Therefore we must use this network instead of 192.168.155.0 network

Boston#configure terminal

Boston(config)#router ospf 2

Boston(config-router)#no network 192.168.155.0 0.0.0.3 area 0

Boston(config-router)#network 192.168.155.4 0.0.0.3 area 0

Boston(config-router)#end

Boston#copy running-config startup-config

Finally, you should issue a ping command from Boston router to Lancaster router to make sure it works well.

Boston#ping 192.168.43.1

Other lab-sims in ICND2 Exam:

ICND 2 – Nat Sim Question

VTP SIM (on 9tut.com)

EIGRP Lab sim (on 9tut.com)

 

Other lab-sims might appear in the real ICND 2 exam, read and understand them if you have enough time.

Comments
Comment pages
1 2 3 4 54
  1. OSPF sim commands not working
    December 5th, 2014

    THANKS RENAN! ;)

  2. ThisKid
    December 16th, 2014

    Thanks Renan!

  3. Koke
    January 2nd, 2015

    Can someone please confirm if this SIM is still valid on the new ICND2.

  4. Rafael ccent
    January 18th, 2015

    I will let you know KOKE i
    am taking the test on the 20th of january 2015

  5. surfsup
    January 24th, 2015

    can anyone confirm that this is the same ospf sim with the same ip addresses? sitting exam soon.

  6. Mr.Paul
    January 27th, 2015

    no one has pointed out that you can just do a show run on router Frankfurt to get the ospf adjacency.
    you still have to remove the network but it is a lot quicker.

    router ospf 2
    log-adjacency-changes
    network 192.168.155.8 0.0.0.3 area 0
    network 192.168.155.4 0.0.0.3 area 0
    network 192.168.29.0 0.0.0.255 area 0
    !

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    February 3rd, 2015

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  8. HR
    February 4th, 2015

    I appreciated to Renan

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    February 4th, 2015

    Please tell me friends….i heard that after 29th January 2015 the ccna exam course will b change…is it true ??????

  10. Victor
    February 6th, 2015

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    February 8th, 2015

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    February 8th, 2015

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  17. Anonymous
    February 17th, 2015

    hi all
    can any body tell us more about ospf lab ?
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  18. K4l-eL
    February 18th, 2015

    Thanks Renan!

  19. ali
    February 19th, 2015

    hi all
    is ospf lab as 9tut icnd2 lab or any change ?
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  20. Anonymous
    February 23rd, 2015

    thanks renan

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    February 26th, 2015

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    February 26th, 2015

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  23. A.
    February 28th, 2015

    Thanks Amigo – Great SIM

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    March 3rd, 2015

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    March 4th, 2015

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    March 12th, 2015

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    March 15th, 2015

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  30. Rohit Prasad
    March 18th, 2015

    ccna 200-120

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  34. jack
    March 27th, 2015

    thanks Renan for sharing this pkt file

  35. Jennifer
    March 29th, 2015

    Hey guys is this OSPF simulation still valid for ICND2 in 2015?

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