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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
Comment pages
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  1. Imad
    October 31st, 2011

    @ 9tut I failed last night in ccna because i didn’t know about this site before the exam…well can anybody confirm that should i get the same sim questions next time ? I’m going to attempt again on 10th nov.

  2. Jameel
    October 31st, 2011

    HI ALL!!!!
    i cleared CCNA today. Got 960/1000. heartly thanx to 9tut and exam collection.com
    here’s a suggestion for everyone who’s preparing for it. refer these…
    1. your self hard work to understand the concepts.
    2. 9tut (V V V V imp.. )
    3. examcollection.com

    sims were EIGRP, ACL and VTP.

  3. Jameel
    October 31st, 2011

    @ Imad dont feel sad buddy. i assure you sims are gonna be same. not in detail. they’ll have same topology but little modification within it. go through each and every word on this website carefully. so that you can understand them well. all the best!!!

  4. confusio
    October 31st, 2011

    i got this question yesterday from the exam… i configure this question very well thnx 9tut.. this site is the best…

  5. pratap
    October 31st, 2011

    wat r all the defects of passive interface

  6. xallax
    October 31st, 2011

    @pratap
    i can tell you one: it kills the routing protocol updates (send and receive) on that particular interface. not good if primary link goes bye-bye and you need a back up link up and running fast

  7. TOUMANY
    October 31st, 2011

    HELLO GUYS?
    IN CONFIGURING EIGRP INSTEAD OF WRITTING TWO STATEMENTS TO ADVERTISE THE NETWORKS:
    #network 192.168.60.0
    #network 192.168.77.0
    #no auto-summary
    WHAT ABOUT THIS ONE:
    NETWORK 192.168.0.0 0. 0.0.255.255
    NO AUTO
    ????????

  8. Jameel
    November 1st, 2011

    @TOUMANY
    EIGRP config dont allow the syntax of using wild card mask.

  9. @deb
    November 1st, 2011

    is this possible to ping r3 to r4?? how??

  10. romix
    November 1st, 2011

    HI, everybody….for those who completed their exam with VTP,ACL2,EIGRP…how many question did u find in the VTP SIM…all 9 questions or 5 only…thx to reply…

  11. TOUMANY
    November 1st, 2011

    @Jameel:
    Please cheick it well,it think wild card works with eigrp.
    get into the router,after putting the statement:ROUTER EIGRP XX ? and see.
    please correct me if i m mistaking.

  12. Imad
    November 1st, 2011

    @ romix i got 5 questions in VTP sim…

  13. moharrem
    November 1st, 2011

    hey all

    this dump is still valid becous i pass in 29/10/2011

    i don`t know about when this dumps end becous i am not cisco to know that

    i talk about questions in my exam i will finished it to valid send to every body want it becous i remember that questions in my exam like ( vtp . eigrp , acl 2 ) in 9tut
    but some of ips different . i mean that no about dumps

    i am sorry to all understanding me wrong

    allah with every body and isa will help him to pass his exam

    am sorry again

  14. Anonymous
    November 2nd, 2011

    This sim is still valid (also had the ACL2 and VTP sims). Passed with a 973 today, even though I saw about 10 new questions I’ve not seen before in the latest dumps. It still pays off to know the stuff underneath the information on this and other sites.

  15. moharrem
    November 2nd, 2011
  16. oriname
    November 2nd, 2011

    Pass my ccna exams 2day! score 858. colisio dums still valid. sim were acl eigrp and vtp. sam like 5 new qsts

  17. mlp
    November 2nd, 2011

    9tut,

    Thanks these helpful information here. My question is after
    ip default-network 198.0.18.0
    ip route 0.0.0.0 0.0.0.0 198.0.18.5
    Do we need write configure “redistribute static”? Could you plese reply my this question to my email:lpng_m@hotmail.com?

    Many thanks!

  18. Deboug
    November 3rd, 2011

    Hello !
    Today i took my ccna test and i kinda failed it 749 was my score but somethin wierd happened to me during the exam with a question very similar to this question

    i typed in the configurations i was pretty sure somthin was missing so i wanted to check to check out if i was wrong or not so i pinged the R1 (or what was similar to it in the exam) interface to check and the ping didnt echo back

    anyhow i wanted to remove the config i added and type the part that was missing but the test program got pugged i am not sure that is my question

    i was able to console the other routers fine but the router i did the config/pinged on was stuck on the ping response giving me nathing to type or do anything

    was that a bug in the program or somthin or that is just how it works ? cuz i basically asked in the center . administrator said he cant help me and i had to move on with the test but ofc i lost the degree of this question ( and some after it due to my haste to compensate for the lost time )
    respond and advice plz on what i should do

  19. rashid sattar
    November 4th, 2011

    please tell me why we not sent packet from router3,2,and4 to isp please tell me

  20. Koffy
    November 5th, 2011

    @ rashid satter

    Yes, you can send packet from router 2…3…4 to the ISP, once you configure IP ROUTE on R1 s1/0 interface,(IP Default network 198.0.18.0…..IP Route 0.0.0.0 0.0.0.0 198.0.18.5) which will be advertise by R1 to R2, R3, and R4., asking R2,R3,R4 to send any packet which does not reference in their routing table to the default route(static route). Normally these are packets destined for the internet. Thanks.

  21. CCNA_Newbies
    November 5th, 2011

    I’m so exciting cause i’ll take the exam at 30/NOV/2011,I hope will pass the exam… ;);)

    Thank you everyone for the shared ideas.

  22. B.
    November 6th, 2011

    @Des

    #wr mem = #copy running-config startup-config

    Use longhand to be sure in actual test

  23. xallax
    November 6th, 2011

    @toumany @jameel
    EIGRP ALLOWS the usage of wildcards.

    packet tracer test:

    added 1 router
    configured its interfaces:

    interface fa0/0
    no sh
    ip add 10.0.0.1 _ 255.255.255.0

    interface fa0/1
    no sh
    ip add 10.0.1.1 _ 255.255.255.0

    went to router configuration mode:

    router eigrp 1
    network 10.0.0.0 _ 0.0.1.255

    verified the advertised networks:

    do sh ip proto

    [..]Routing for Networks: 10.0.0.0/23 [..]

  24. TOUMANY
    November 6th, 2011

    @Xallas:
    Thanks,
    I do agree with you,wild card mask can be used to configure EIGRP.

  25. marlon tylon
    November 7th, 2011

    Hello guys. will take the exam on 11/11/11. My original date date was postponed by the centre due to network problems. Any changes guys???

  26. tubbs
    November 11th, 2011

    past test today. thanks to 9tut and dumps. There where lots of new questions I had not seen in any dumps had ACL2 EIGRP and VTP labs. VTP was tricky because the router AC3 was set as server so it had updated its own vtp.

  27. Ron
    November 14th, 2011

    I took my CCNa exam today and failed, I know I screwed up in SIMs..did anyone had the following EIGRP question ? if yes, is there anything needed extra except configuring EIFRP (i.e. configure main router with ISP) or cisco is just confusing with keyword “ISP” ? Please advise.

    CCNA.COM has a small network that is using EIGRP and its IGP, All routers should be running an EIGRP AS number of 112. Router Campus is also running static routing to the ISP.

    CCNA.COM has recently adding the Main router. Currently Main router does not have connectivity to the ISP router to ISP router. All other interconnectivity 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(s) to provide full connectivity between the router.

  28. Pradeep
    November 16th, 2011

    give me detail info about the redistribution of ospf an eigrp ???????????

  29. Des
    November 16th, 2011

    @Ron

    yeah, i screwed that one up too. after you change the router’s AS number to match the other routers, you then have to go to the main router (the one that connects all 3 routers together) to add the network address of the router whos AS number you just changed.

    hope that helps.

  30. christina
    November 16th, 2011

    @Des

    bt wen u change the AS values on routers u add the network address anyway in one go like stated above in sims… so i dnt understand that y do u have to go back to the main router to add network address after the AS has been changed.

    for e.g. router eigrp 112
    network 192.168.77.0 or so on
    OR
    no router iegrp 22
    router eigrp 112
    network 192.168.60.0
    network 192.168.77.0 so on depends wat ip addresses they give
    no auto-summary

    this is how the config is done bt i dnt understand ur comment above plz dnt mind i just want to be clear.

    @RON
    u said that u had this in ur eigrp sim “Router Campus is also running static routing to the ISP” anyone plzz…..does that mean we have to config static routing on isp or on any other routers or we just leave it as it is, like “passive interface” btw isp main router in previous eigrp sim, coz they have modified the eigrp sim…

    anyone can help here plzzz ….

  31. myself
    November 17th, 2011

    someone pliz send me the latest dumps of CCNA to ecky2010@live.com.. im planing to take the exam late next week.. ill be happy.

  32. Meeshoo
    November 17th, 2011

    Hello all,

    Could someone please send me the latest dumps at meeshoo80@yahoo.com.

    Thank you in advance.

  33. VTP
    November 18th, 2011

    PASSED EXAM TODAY

  34. Koffy
    November 18th, 2011

    @christina

    First, do a sh. run. on main router to be certain all the router are form and exchanging update. If for some reason, one of the router is not form, then do a sh. run on that router. Possibly a different AS number might be the cause. You then go through the process of changing the AS number, and then advertise the network. At this point you have only solve half of the problem.
    Secondly. go to the main router and include the router’s network in the statement of the main router. Remember to do the “no auto-summary”. You can do a “ping” from the router to the main router just to be sure and to be safe.
    If needed you also do the “no passive-interface OR passive-interface, depending on what is required.
    I hope this help to somewhat. Thanks.

  35. Samuel
    November 18th, 2011

    @VTP is not fair you have to advise us !!!

  36. NEEDLE
    November 19th, 2011

    After I changed the AS, i’m having a problem indicating the network under router eigrp
    it is said there:
    network 192.168.60.0
    network 192.168.77.0

    How do you get those networks? What is the subnet mask?

    This is my calculation
    network Address for R1 and R2 = 192.168.36.12/30
    R1 s0/0 = 192.168.36.13
    R2 s0/0 = 192.168.36.14

    network Address for R1 and R4 = 192.168.60.24/30
    R1 s0/1 = 192.168.60.25
    R4 s0/1 = 192.168.60.26

    network address for R1 and R3 = 192.168.77.35/30
    R1 fa0/0 = 192.168.77.33
    R3 fa0/0 = 192.168.77.34

    I was wondering why 192.168.77.0 and 192.168.60.0?????? Can it be 192.168.77.35 and 192.168.60.24?

  37. Koffy
    November 20th, 2011

    @NEEDLE

    Lets analyze it step by step.

    Step 1.
    From the Sh. run on Router3. We notice R3 has wrong AS value. We need to change the value.
    R3>enable
    R3#config t
    R3(config)#no router eigrp 22
    R3(config)#router eigrp 212

    Step 2.
    Advertise R3 network.
    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 run start

    Step 3.
    Include R3 network in R1 network statement.
    R1>enable
    R1#config t
    R1(config)#router eigrp 212
    R1(config-router)#network 192.168.77.0
    R1(config-router)#no auto-summary
    R1(config-router)#end
    R1#copy run start

    From your statement, I think you are confusing network addresses and interface addresses.
    Network addresses is what you advertise to the neighboring routers, eg. R3 to R1 OR R3 to R1 OR R4 to R1.
    Interface addresses are, eg Fa0/1, Fa0/1, Se0/0 so on and so on.

    When you are configuring your interface, you use the mask, depending on your subnet mask and how is broken down. Eg /28 is broken down into addition of 16…./30 is addition of 4…..
    R3 fa0/0 192.168.77.34 255.255.255.252……/30
    R3 fa0/1 192.168.60.65 255.255.255.240……/28
    R3 fa1/0 192.168.60.81 255.255.255.240……/28
    Make sure your interfaces are “ON” with the “no shutdown” command.

    I hope this helps you figure out network addresses and interface addresses. Thanks.

  38. NEEDLE
    November 20th, 2011

    Hi Koffy!

    So I’m configuring interface addresses?

    I know the steps, that we need to change the AS in R3, then add 192.168.60.0 and 192.168.77.0 then go back to R1 advertise R3, add 192.168.77.0

    But I’m asking why the networks to be advertise are: 192.168.60.0, 192.168.77.0? all /24? is it indicated in the problem or in the sim? Why it can’t be the network address 192.168.77.34 and 192.168.60.65?

    Usually in our lab, it is already indicated the network to be advertise. So, i’m confuse… 192.168.77.34 and 192.168.60.65 are network adddresses as well, why 192.168.60.0 and 192.168.77.0?

  39. Samuel
    November 20th, 2011

    please guys update us ? tall us more about question is it the same to 9tut.com and simulation ?

  40. Koffy
    November 20th, 2011

    @NEEDLE

    Let say, you are offered a block of address 192.168.60.0/24, and you have 3 other hosts within your network. it is your now your duty to subnet this block of /24 within your networt (subnetwork). This where subnetting skills comes in play.

    For instance R3 has /24 and wanted to subnet to fa0/0 and fa1/0
    fa0/0 192.168.60.65 255.255.255.240/28……..this is from 64 to 80 increment of 16(sub-zero enable) .79 is the broadcast address.
    fa1/0 192.168.60.81 255.255.255.240/28…….this is from 80 to 96 increment of 16(sub-zero is enable) .95 is the broadcast address.

    So basically, a block of address is the network address, and is broken down or subnetted in the most efficient manner for address conservation.

    In otherwords, 192.168.60.65/28 and 192.168.60.81/28 are addresses that belongs to network 192.168.60.0/24(subnetted). And 192.168.77.34/30 belongs to 192.169.77.0/24(subnetted).

    Remember that fa0/0 on R3 and fa0/0 on R1 must share this same address space (serial link) /30

    For a better understanding, you must first grasp the concept.

  41. NEEDLE
    November 20th, 2011

    Hi Koffy

    Ok… yes.. 192.168.77.34 and 192.168.60.65 are subnetted of 192.168.60.0 and 192.168.77.0.

    So in the exam will CISCO indicate the 192.168.60.0 and 192.168.77.0 or at least the subnet like /24? Because in this sim it does not indicate the subnet. The only given is the subnetted parts.

  42. Koffy
    November 20th, 2011

    @NEEDLE

    Actually, the above sim indicates the subnets.
    The above sim is similar and identical to Cisco exams. The sh. run command on the main router and the individual routers displays all networks and interface addresses. You should be able to differentiate the network addresses from the interfaces addresses.

    Eg. 192.168 60.0………../24 Network address.
    192.168.60.65 255.255.255.240…………../28 Interface address.

  43. david(CCNA)
    November 21st, 2011

    this site is extremely helpful to pass the CCNA exam. Thank you guys for all the sims and questions on this site. just go through all the sims and the 665q dumbs.. study the sims and concept mainly.. you learn a lot from these questions and thus you can handle almost any ccna question from the enhanced knowledge you get through these dumbs and sims. my advice is to use these material positively to enhance your knowledge and thus help yourself to pass CCNA. GOD bless!!

  44. christina
    November 21st, 2011

    @koffy

    thanks alot for ur help…..there is no auto-summary on R1 in pink sims above so i assumed u dnt use no auto-summary on R1 only used on R3. thats where i was gng wrong.

    at my understanding no auto-summary is required at both R1 n R3.

    thanks once again koffy

  45. sherif
    November 21st, 2011

    @9tut
    i can’t ping the ISP router from any router except from R1
    and i try to this static commands in R1 but there no reply

  46. kanit
    November 21st, 2011

    @sherif
    coz. ISP router not have routing.

  47. Andri
    November 21st, 2011

    just FYI the router 212 change to 222
    someone name Rohanat has just explained, he has done the exam today….
    source http://www.9tut.com/share-your-experience/comment-page-155#comment-152868

  48. serial
    November 21st, 2011

    can someone confirm if “?” can be use during the exam?
    how about “tab” and show commands, will it deduct a point if used?

    thanks to all who have shared their experience, it is helping us all newbies…. :)

  49. sherif
    November 21st, 2011

    @ kanit
    so i have to make eigrp 212 on ISP router to have successful ping from any router

  50. mlp
    November 21st, 2011

    I passed my exam on 15th of Nov. Thanks 9tut very much.A

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