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CCNA EIGRP LAB Question

January 25th, 2014 Go to comments

Question

After adding R3 router, no routing updates are being exchanged between R3 and the new location. All other inter connectivity and Internet access for the existing locations of the company are working properly.

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

Access to the router CLI can be gained by clicking on the appropriate host. All passwords on all routers are 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 cisco 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.

Other lab-sims on this site:

CCNA Access List Sim

CCNA NAT SIM Question 1

CCNA NAT SIM Question 2

CCNA Frame Relay Sim

CCNA Configuration SIM Question (RIPv2 SIM)

CCNA VTP SIM

CCNA Drag and Drop SIM

CCNA Implementation SIM

 

Comments
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  1. hi
    July 12th, 2012

    @Gio.
    ok, thanks.
    i just want to make it clear.
    will route to isp appear like in PT or not.
    actually lab is quite simple.

  2. Gio
    July 12th, 2012

    @hi

    Oh, i dont know if that route will appear during exam…
    I’ll tell you next saturday… After my exam session..:)

  3. Angel
    July 13th, 2012

    Hi
    Anyone can explain the modifications?
    What to do if there is a passive interface between the routers or between R1 and ISP?
    Can you please tell me the exact commands I need to use in exam for passive interface.

    Thanks in advance.

  4. hi
    July 13th, 2012

    @Angel

    like Gio said:

    If you find passive interface on interfaces connected to hand devices, its ok..

    If you find passive interface on interfaces connected to another router, then you have to give the “no passive-interface” to that int..

    If you find passive interface on interface connected to ISP, its ok..

  5. Newbie-sl
    July 13th, 2012

    does it needs to remove 198.0.18.0 from eigrp and add default route for isp and redistribute the static

    please comment

  6. Gio
    July 13th, 2012

    @newbie

    I report again this feedback..

    “Important feedback from idris:
    “EIGRP with a diff AS number. But bear in mind the ping from the routers to the ISP didnt work even though the question stated it is all working and in place. Waisted too much time on this and realised it must be shortfall of the sim, got 100% in the end. So just get the routing work and make sure neighbour relationship is formed by sh ip eigrp neigh”

  7. Pierre
    July 13th, 2012

    Gio , Thanks for the inputs , i have exam after 3 days ,can i have yr email for small chat please

    thanks

  8. Gio
    July 13th, 2012

    @Pierre

    I have exam tomorrow..!!

    no problem..

    write me at popupgio at gmail.com

  9. HULK
    July 14th, 2012

    using wch cmnd we can find passive interface??

  10. Anonymous
    July 14th, 2012

    @hulk

    Sh run

  11. hi
    July 14th, 2012

    Hey Gio.
    Did you pass? :)

  12. anish
    July 14th, 2012

    hello friends….Thank GOD…I passed ccna few minutes ago….I got 930..Thanks to 9tut,Jericho,Collisio,Bruce and more exam collection..The sim was eigrp with as no:112,VTP and ACL…And guyz I did a biggest mistake such that during VTP sim after the first question I press next…So I lost the chance for the 4 remaining vtp sims..:( be careful…no need to worry…any help text me ani_tech4u@yahoo.com

  13. Pierre
    July 14th, 2012

    hi anish , i added u , can we have a chat for this

    thanks

  14. Pierre
    July 14th, 2012

    what shall i write for the vtp after i finish first question ?

  15. anish
    July 14th, 2012

    @Pierre…
    With great pleasure…I wl be here for sharing information with those people who are preparing for exam….and I think In that window some option is thr….look carefully…..do next button only after completing the sim…

  16. Pierre
    July 14th, 2012

    Thanks Anish , May you accept my add request so we can chat ?

  17. Mun
    July 15th, 2012

    hi friends
    If i found the “passive int ” btw R1 & any other router, i know “no pass-int” will solve it but how can i apply it, ex: R1(config)# no pass-int
    is that all ??

  18. rene
    July 15th, 2012

    @mun:

    The actual command should be
    no passive-interface s???

    where s??? is the interface where you found the “passive interface” rule.

    to make it clear;

    #router eigrp 212
    #no passive interface …..
    #end
    #copy running-config startup-config

  19. rene
    July 15th, 2012

    by the way, if you did it correctly the router R1 would say it has made a new adjacency

    (not sure if on the exam it will show as well but packer tracer does)

  20. Jake
    July 16th, 2012

    Hi can anybody send me the latest dumps in blastmyfuture@hotmail.com Thanks. I will be taking the exam this month.

  21. Sajawal
    July 16th, 2012

    of course like your web site but you need to test the splnileg on several of your posts. Several of them are rife with splnileg problems and I find it very bothersome to tell the reality nevertheless I will certainly come back again.

  22. Michelle
    July 16th, 2012

    Firstly, the connector will not rttoae 90 degrees as shown in the picture. It is fixed as an inline only connector. Secondly, the device will not register online as it says the T-Mobile site is temporarily out of order. It has been out of order for 72 hours. This sugests that T-Mobile are not the best service provider available. I have gone back onto Vodafone which works perfectly. This unit is not a good buy.

  23. Brandon
    July 16th, 2012

    I have a question any help would be greatly appreciated.

    9tut answer:
    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 cisco 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

    Then the second part of the question says:

    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

    The above question stated to use both 192.168.60.0 and 192.168.77.0 so why is the second part when asking for the network 9tut just says 192.168.77.0?? I don’t understand where they are getting the IP 192.168.77.0 Arent they both the network address so i shoudl add both or how do you know which one to add??

    Hope I make sense. Thanks in advance,

  24. 9tut
    July 16th, 2012

    @Brandon: Please notice that the command “R1(config-router)#network 192.168.77.0″ is configured on R1, not R3 because R1 is missing the network 192.168.77.0 (which connects between R1 and R3).

  25. Jesrie
    July 17th, 2012

    I have a question. I have been taught that when you input a network in EIGRP that you have to include a wildcard mask after the network address. In this question, no wildcard masks are entered. Why is that? And also, if I enter a wildcard mask in the exam, will I be marked wrong? Thank you for the help.

  26. LKX
    July 17th, 2012

    @mike
    Thx
    Just wondering if in a network all routers use distribute list, will the EIGRP collapse?

  27. swathi
    July 17th, 2012

    when i am practicing in dumbs simulations are not working i have doubt in that please help me friends. I am writing exam july last week.

  28. Brandon
    July 17th, 2012

    Thanks 9tut for your answer, but can you answer another question? Where are these IP address coming from

    R3(config-router)#network 192.168.60.0 ( where are thse address coming from?)

    R3(config-router)#network 192.168.77.0 ( where are thse address coming from?) Yoy say this is Router 1? where or how do we know this is router 1? I am confused.

    You indicated that the above address connects R-1 to Router-3 how do we come up with that conclusion based of the diagram above? I appreciate your help!

  29. Tom
    July 17th, 2012

    Today i passed with 1000/1000 score.

    EIGRP was the same, but central router has one network typed wrong. i denied it with no statement.

    finished all in about 55 minutes.

    Good luck all

  30. Tamsanqa
    July 18th, 2012

    fake as a helicopter hoisbybt, I can tell you this program is missing lots of things, where are the controls for rudder and gaz also how is he mixing the gaz curve and pitch on his iPhone controlling a rc helicopter is much more complicate than controlling the swashplate (but this is a good idea)this helicopter is expensive and not the best to test this program, also for a first fly, the pilot wouldn’t have missed to use a training landing kit which cost less than 10$ I bet there is someone with the transmitter behind

  31. Pedro
    July 18th, 2012

    12. 2010/09/25 09:20 其实,让PC做“路由器”为什么还要用软件呢,直接用点对点网络不就好了?我测试过,点对点网络业能支持多个设备连接(1)玄女 2010/09/26 21:01@看海的狐狸, ad hoc至少在老的系统(XP/WM6.1)里面是不支持高于WEP的加密的——那就是说和没有加密一样。虽然说短时间用用感觉没啥,但是只要有任何别有用心的人在旁边嗅探一圈的话……不说蹭网了,人家把截获的数据拿回去解出个QQ密码什么的就够难受了。(0)jiangjun 2010/09/27 22:20@看海的狐狸, 老系统只能ad hoc,但HTC手机不支持ad hoc , 所以得用更高级的。 嘿嘿(1)玄女 2010/10/07 11:14@jiangjun, 谁说不支持Ad Hoc……HTC自己在Windows Mobile下面的Mobile WiFi Router就是Ad Hoc。不过在使用Ad Hoc之后会带来一些奇怪的问题(或者和我的ROM有关)。不过我不确定WM 6.5及Android是不是也这样,我一直坚定支持WM 6.1……(0)kofcsjx 2010/10/07 18:30@jiangjun, android手机,有一个叫做“移动AP”的软件……(0)

  32. Gio
    July 18th, 2012

    @Hi

    Yeah buddy…

    I got 960…

    With my suprise, I got only 75% ACL Lab…

  33. Gio
    July 18th, 2012

    @Tom

    Same question on my exam about Eigrp.. I removed one network..

    You remember your answer about ACL sim..??

  34. Brandon
    July 18th, 2012

    Thanks 9tut for your answer, but can you answer another question? Where are these IP address coming from

    R3(config-router)#network 192.168.60.0 ( where are thse address coming from?)

    R3(config-router)#network 192.168.77.0 ( where are thse address coming from?) Yoy say this is Router 1? where or how do we know this is router 1? I am confused.

    You indicated that the above address connects R-1 to Router-3 how do we come up with that conclusion based of the diagram above? I don’t see a 192.168.77.0 in the diagram. I appreciate your help!

  35. Brandon
    July 18th, 2012

    Gio,

    Can you explain the EIGRP lab you got for me? One network wrong? If you could explain in more detail that would be great.

  36. Brandon
    July 18th, 2012

    9tut, or anybody.

    when I download the sim here and want to practice it do i import it into packet tracer 5.1? If so how do i import the sim into packet tracer 5.1 so i can practice? Please any help would be appreciated. I am confused on how to import the sim into packet tracer 5.1. Thanks in advance for your help.

  37. 9tut
    July 18th, 2012

    @Brandon: Please use at least Packet Tracer v5.3 to open them.

  38. Brandon
    July 18th, 2012

    Thank you!

  39. xallax
    July 18th, 2012

    @brandon
    interesting topic. please read more here: http://www.certprepare.com/forum/index.php?showtopic=1664

  40. David
    July 19th, 2012

    @all

    The mission for this task is to ping all routers by R3? i pinged all routers but the ISP cannot.

    only R1 can ping the ISP…am i doing wrong?

  41. DNT
    July 19th, 2012

    @brandon

    You need to read the network topology then u will see where those ip address come from

  42. DNT
    July 19th, 2012

    @LK X

    The Established key word is used for TCP protocol only. It allows the traffic flows back to the network once the connection is established. For ex. Traffic flow out network using Http and the the nature of Http requires traffic flow back. Hope it make sense

  43. NSTALN
    July 19th, 2012

    I just took the 640-802 today for the first time. I passed with a score of 854. I had 2 sims on my test: the EIGRP LAB and the ACL 2 SIM…both labs were dead-on(as far as the solutions).

    There were also at least 5-6 questions that were exactly the same as the questions in the specific categories listed on the right hand side of this site. I only skimmed through a handful of the categories so I suspect there were quite a few more that i just didn’t see.

    Anyways this website is/was very helpful. I passed on the first time and so can you! Good luck.

  44. someone-who-just-passed
    July 20th, 2012

    just passed my exam (about 3 hours ago)

    EIGRP, VTP and ACL2 where in there.
    EIGRP mistake was on a different router and network ranges were different.
    ACL2 was HOST B in my case, the rest was the same
    VTP… was my first from the 3 and I almost choked… I tried entering some commands and it refused…. but it was silly me who forgot to go into configure mode.

    Had quite some questions which aren’t on 9tut, but I studied the books so it wasn’t too bad.
    Subnetting wasn’t the most for me, it was more the EIGRP,RIPv2 and OSPF questions.

    It was my first time doing the exam, so I had to get used to the lab’s and all.
    I know it has been written somewhere, though it wasn’t clear. When you get the lab question, and you need to configure a router. Each router will have a workstation icon with a dotted lin to it attached. Press the workstation icon to get on the console of the router. No need to connect or anything, you will get the console!

  45. glad_student
    July 20th, 2012

    I passed today, 973/1000

    SIMs: EIGRP, ACL2, VTP

    In the EIGRP Sim i had to delete a network on the main router, like Gio and Tom did it before.

    my case:

    no network 192.168.55.0

  46. Layer13
    July 20th, 2012

    Hi all,
    can anybody tell me something about this ”passive-interface” ,please?
    I fully understand we have take it off of any interface excluding ISP interface.
    But do we have to configure it on the interface between R1 and ISP if passive-interface has not been configured at all ?

    Thank you.

  47. Ahmed
    July 21st, 2012

    Hi,
    In real exam is ping working, for testing my configuretion? also if i wrote wrong configuration statement, will it give me %unrecof=gnized error like simulators or just it would accept it as written

  48. b
    July 21st, 2012

    i am going to write exm monday is the lab given same in 9tut comes same with out any changes , wat is the changes.
    wat is the change in acl
    wat is change in eigrp
    change in vtp

    is collision dumps is valid or we get questions from other dumps pls help me

  49. b
    July 21st, 2012

    is passive interface is askeb in eigrp for exam glad_stu

  50. b
    July 21st, 2012

    wat and all question u got in lab can u pls tel me weather it is same as in 9 tut. or diff pls hepl me out .
    some-one-passed -exam

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