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CCNA EIGRP Lab

January 25th, 2014 Go to comments

Question

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.

ccna_eigrp_sim

R1
Fa0/0: 192.168.77.33
S1/0: 198.0.18.6
S0/1: 192.168.60.25
S0/0: 192.168.36.13
R2
Fa0/0: 192.168.60.97
Fa0/1: 192.168.60.113
S0/0: 192.168.36.14
R3
Fa0/0: 192.168.77.34
Fa0/1: 192.168.60.65
Fa1/0: 192.168.60.81
R4
Fa0/0: 192.168.60.129
Fa0/1: 192.168.60.145
S0/1: 192.168.60.26

Answer and explanation

(Note: If you are not sure how EIGRP works, please read my EIGRP tutorial: http://www.9tut.com/eigrp-routing-protocol-tutorial. Note: You can download this sim to practice here: http://www.9tut.com/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

ccna_eigrp_sim_show_run

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)#network 192.168.60.0

R3(config-router)#network 192.168.77.0

R3(config-router)#no auto-summary

R3(config-router)#end

R3#copy running-config startup-config

Check R1 router with the show running-config command:

ccna_eigrp_sim_show_run_2

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(config-router)#network 192.168.77.0

R1(config-router)#end

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!

Modifications:

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:

R1:

!
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 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
!

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
network 192.168.77.0 0.0.0.3

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 192.168.30.1/28 and 192.168.30.17/28 but you only want to run EIGRP on the first interface, you can type “network 192.168.30.0 0.0.0.15” under EIGRP process.

Comments
Comment pages
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  1. Anonymous
    August 13th, 2016

    Can someone advise if page 180-183 has been asked from the 9tuts dumps? I see ppl discussing oly about ACL1,2 ospf and eigrp. What about the ones in these pages , do they appear in the exam?

  2. Anonymous
    August 14th, 2016

    Hey guys ,
    i Failed in the test twice . I think i have old dumpers. Can someone send them to me on my email:
    mohamedhossamamer @ GMAIL.COM

  3. Ted
    August 15th, 2016

    Hi Everyone Taken the exam

    What was your drag and drop question or questions ?

    Studying all of them just want to know what the might have

    Thanks !

  4. Ted
    August 15th, 2016

    anyone

    someone in the ‘ Share your CCNA Experience ‘ is disagreeing with me regarding line 3
    in the acl2 exam being ‘ permit ip any any ‘

    for the mod 1 and 2 the 9tut shows to use permit ip any any
    for mods 3,4 it says:

    access-list 100 permit ip any host
    (The IP of Public Web Server will surely be given in this question) but in the exam you should use “access-list 100 permit ip any any”

    any thoughts, recommendations ?
    as I have seen many comment to use ‘ any any’ I had thought that sounded like ‘ cisco’s ‘ answer..

  5. HP
    August 15th, 2016

    permit ip any any is the correct one.

  6. ted
    August 16th, 2016

    Hello,
    Has anyone had in the EIGRP troubleshooting sim in the exam any of these answers:

    loopback interface shut down
    Passive-interface is configured.
    auto-summary enabled so only the 10.0.0.0 network is shown. (I ask this question as the packet tracer sim I have shows R4 in incorrect AS
    and auto-summary enabled)

    for OSPF anyone get this an answer:
    The Layer 2 encapsulation of the serial links is mismatched

    Thanks

  7. Ted
    August 16th, 2016

    Hello,
    Has anyone had in the EIGRP troubleshooting sim in the exam any of these answers
    I know its not likely the answers for the eigrp troubleshooting sim or eigrp would be these answers, just wanted to be sure, especially if auto summary is enabled:

    1. The loopback interface on RX is shut down.( RX being for different question)
    2. Passive-interface is configured.
    3 . By default, automatic summarization is enabled, so only the 10.0.0.0 network is shown.
    (I ask this question as the packet tracer sim I have shows R4 in incorrect AS
    and auto-summary enabled)

    Although EIGRP sim says no auto summary is default in the exam so I am guessing this is correct answer.
    Note: In the exam, this sim uses IOS version 15 so “no auto-summary” is the default setting of EIGRP. You don’t have to type it.

    for OSPF anyone get this an answer:
    The Layer 2 encapsulation of the serial links is mismatched

    Thanks

  8. Fer
    August 17th, 2016

    Is this labs are on the test?

  9. Light
    August 18th, 2016

    @Ted, it could be these answers or the old ones or a mix. 9tut explains how to look for BOTH

    just read the explanations on 9tut about the answers and how to look for the alternative possibilities

  10. RT
    August 18th, 2016

    Hi everyone, i need help for confusion regarding labs:
    i am a bit confused about labs to be appear in exam and and what i got is below.
    there will be 4 labs consist of acl1, acl2, eigrp and ospf
    Acl1 (no need to configure just use show commands to answer multiple choice questions)
    Acl2 need configurations
    EIGRP: (CONFUSED: EITHER WE NEED TO CONFIGURE IT AS REQUIRED OR WE HAVE TO TROUBLESHOOT IT OR JUST USE SHOW COMMANDS TO ANSWER MULTIPLE CHOICE QUESTIONS)
    OSPF: (CONFUSED: EITHER WE NEED TO CONFIGURE IT AS REQUIRED OR WE HAVE TO TROUBLESHOOT IT OR JUST USE SHOW COMMANDS TO ANSWER MULTIPLE CHOICE QUESTIONS)
    Please help me in this regard and correct me if am wrong.
    Thanks in avance

  11. Anonymous
    August 19th, 2016

    can someone send me questions dump in watson Im taking ccna today, karbug14athotmail.com

  12. soso
    August 19th, 2016

    Hi All ,can anyone send me the VCE setup sopprusbarbosa at gmail dot com

  13. Krutz
    August 25th, 2016

    Hello, Everyone. Is there any chance that I can have new CCNA exams dumbs and lab since I have old one. So i would like to update my self. loselife44 on yahoocom

  14. jhoncas
    September 6th, 2016

    Hello everyone, can someone send me the last question dump CCNA Exam 200-125
    {email not allowed}

  15. jhoncas
    September 6th, 2016

    Hello everyone, can someone send me the last question dump CCNA Exam 200-125 {email not allowed}

  16. jhoncas
    September 6th, 2016

    trespuntosnegros gmail.com

  17. Bob
    September 6th, 2016

    In the question here only IP address is given without prifix/subnet mask so how to evaluate the subnet mask ?

  18. Manjunath
    September 11th, 2016

    Hi All,

    looking at all positive responses
    I will take ccna exam this month end
    Please share the latest dumps or the spike dumps to {email not allowed}
    Thank you all in advance.

    Best Regards,
    Manjunath

  19. Manjunath
    September 11th, 2016

    Hi All,

    looking at all positive responses
    I will take ccna exam this month end
    Please share the latest dumps or the spike dumps to
    princemanjunath22 at rate gmail.com
    Thank you all in advance.

    Best Regards,
    Manjunath

  20. kk
    October 10th, 2016

    Hi,

    Can anyone explain why the network advertised is ‘network 192.168.77.0’ instead of ‘network 192.168.77.32 0.0.0.3’ ?

    Thanks

  21. Ahmad
    October 11th, 2016

    Dear kk
    You can use wildcard masks or not, it does not matter.
    depending on the question, wildcard like 0.0.0.3 use for specify network with range 3 ip
    you can search about wildcard article :)

  22. awi-hensem
    November 28th, 2016

    just pass today – 3 hours ago..

    171q still valid – thanks to PAPP, lab question ACL Mod3, tshoot ospf, eigro, dhcp.. Thanks to 9tut. New question, but forget already. Involving acl.

  23. RusKZ
    January 4th, 2017

    How does the test tshoot ospf?

  24. Myra
    January 10th, 2017

    (trance, progressive) armin van buuren anthems fhg_mp3 320kbps – myfreemp3.review/search/(trance,-progressive)-armin-van-buuren—anthems—fhg_mp3—320kbps/
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  25. Anonymous
    January 11th, 2017

    plz is 171 q is vaild untill now ??

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