January 25th, 2014 Go to comments


Your company has just added R3 router to the existing network. But currently no routing updates are being exchanged between R3 and the network. All other connectivity, including Internet access are working properly.

The task is to identify the fault(s) and correct the router configuration to provide full connectivity between the routers.

All passwords on all routers are set to cisco.

IP addresses are listed in the chart below.



Answer and explanation

(Note: If you are not sure how EIGRP works, please read my EIGRP tutorial: http://congressreiki.ranm.org/?all=eigrp-routing-protocol-tutorial. Note: You can download this sim to practice here: http://congressreiki.ranm.org/?all=download/9tut.com_CCNA_EIGRP_sim_question.zip)

We should check the configuration of the new added router first because it does not function properly while others work well. From the command line interface of R3 router, enter the show running-config command


From the output above, we know that this router was wrongly configured with an autonomous number (AS) of 22. When the AS numbers among routers are mismatched, no adjacency is formed.

(You should check the AS numbers on other routers for sure)

To solve this problem, we simply re-configure router R3 with the following commands:

R3>enable (you have to enter Secret@9tut as its password here)

R3#configure terminal

R3(config)#no router eigrp 22

R3(config)#router eigrp 212



R3(config-router)#no auto-summary


R3#copy running-config startup-config

Check R1 router with the show running-config command:


Notice that it is missing a definition to the network R3. Therefore we have to add it so that it can recognize R3 router

R1>enable (you have to enter cisco as its password here)

R1#configure terminal

R1(config)#router eigrp 212



R1#copy running-config startup-config

Now the whole network will work well. You should check again with ping command from router R3 to other routers!


Maybe in this EIGRP Sim you will see the “passive-interface …” command somewhere in R1 configuration. If the link between R1 to R2; or R1 to R3; or R1 to R4) routers has the “passive interface” then we have to remove it with the “no passive-interface …” command because it prevents EIGRP update from being sent on that interface. But if the “passive interface” is applied to the link between R1 and ISP router like this:


router eigrp 212
passive-interface s1/0

then we just leave it. Don’t use the “no passive-interface s1/0” on R1 because the link between R1 & ISP doesn’t need EIGRP to run on it. A static route from R1 to ISP & “ip default-network” command in R1 are correct so that all the routers (R1, R2, R3, R4) can access the Internet.

(Note: The “ip default-network” command in R1 will advertise the static route of R1 (to go to the Internet) to other routers (R2,R3,R4) so that they can access the Internet too). In the exam you will see these lines in R1 configuration:

ip default-network
ip route

If you want to learn more about “ip default-network” command please read: http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094374.shtml

I read recent comments and realized that you will see the “passive-interface” in the link between R1 & ISP router so just leave it.

Note: Also some readers confuse about if we should use the wildcard masks on the “network” statements under EIGRP process or not. For example should we use:

router eigrp 212

The answer is: we can use wildcard masks or not, it does not matter. Not having a wildcard mask does not make the routes conflicting. The “network …” command in EIGRP (and OSPF, RIP) does not means “advertise this network” but means “If I has interface(s) belongs to this network please turn on EIGRP on that interface. Therefore when you don’t use wildcard mask EIGRP will turn on EIGRP on all interfaces that belongs to the network you specify in the “network …” command.

You should only use wildcard mask on EIGRP if you have 2 or more interfaces that belong to the same major networks but you don’t want to run EIGRP on all of them. For example if your router has 2 interfaces whose IP addresses are and but you only want to run EIGRP on the first interface, you can type “network” under EIGRP process.

Comment pages
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  1. Raju
    February 27th, 2018

    Hi guys any latest dumps for 200-125

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    April 29th, 2018

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  3. foomaqnshe
    May 4th, 2018

    thank u so much

  4. quantisol
    May 10th, 2018

    Thanks for the explanations.. God bless you. My exam is next week.

  5. Anonymous
    May 19th, 2018

    quantisol4atgmail.com am writing next week help me with the sim questions and others. Thanks CCNA guru’s

  6. Luis
    June 2nd, 2018

    This one I didn’t had in my exam today and I study alot

  7. William
    July 8th, 2018

    Do I need apply
    ip default-network
    ip route
    if R1 is missing?

  8. Atul Verma
    July 17th, 2018

    If you are looking for the comparison of the commands between Cisco and other, here are the links
    Cisco and Brocade

    Cisco and Juniper

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    July 20th, 2018

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    August 31st, 2018

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  11. Erik
    September 2nd, 2018

    Thank you so much for the explanation at the “Note” part

  12. ccna-pursuit
    September 18th, 2018

    are there any chances that this lab will be in exam or Is it for practice purpose

  13. Erik
    September 28th, 2018

    I think it’s only for practise purpose.

  14. cleo
    October 11th, 2018

    may i know the password, not working Secret@9tut. Thanks

  15. Tatsev
    October 18th, 2018

    Hi Guys,
    please send my the last guides ccna 200 125 to useradmin@dotmaildotbg

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  16. wonderkid
    October 31st, 2018

    I wonder has there been a new dump recently? anyone have a link?

  17. wonderkid
    November 14th, 2018

    why are we not adding no auto summary to R1 but we added it to R3?

  18. Deus
    December 3rd, 2018

    Thanks for the explanation, am sitting for my paper next week.

  19. Deus
    December 9th, 2018

    @Wonderkid it will still work if you don’t add no auto-summary

  20. Anonymous
    December 13th, 2018

    in the eigrp config what if you specify network wild cards instead classfull network in the network statement.
    would it be wrong and fail me on ccna exam or it would be accepted as a right answer?
    i mean instead of: network
    would have typed : network
    any idea ?

  21. Anonymous
    December 30th, 2018

    these labs are already solved i need a lab sim which are not solved please forward me on {email not allowed} Thanks!

  22. bill
    January 11th, 2019

    hi, out of habit and what i have seen from official CCNA books, i would always do network as standard method

    Anonymous December 13th, 2018
    in the eigrp config what if you specify network wild cards instead classfull network in the network statement.
    would it be wrong and fail me on ccna exam or it would be accepted as a right answer?
    i mean instead of: network
    would have typed : network
    any idea ?

  23. J.J
    January 11th, 2019

    Thanks for the notes! It is quite helpful!

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    January 28th, 2019

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  32. Charpazo
    May 11th, 2019

    hello the interface f0/0 of R3 ? is ok ? is not the ip of a network

  33. Anonymous
    May 11th, 2019

    hello charpazo is ok

  34. Charpazo
    May 11th, 2019

    ups sorry

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