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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. helper
    February 17th, 2013

    @Nzr i got your point regarding the no passive interface thanks

    but the network 198.0.18.0 is inside eigrp 212, should we issue the command no network 198.0.198.0 ? or it has to be in the eigrp area? because i read somewhere that the link between the router and the ISP doesnt need to be in the eigrp area !

  2. Blue
    February 17th, 2013

    What in the world are you guys talking about?
    Has the eigrp changed?
    Is it different from the eigrp sim above?
    Help!!!!!!

  3. Willy
    February 18th, 2013

    I can do the first one correctly.. The 2nd one causes problems..
    What am I overlooking?

    no router eigrp 22
    router eigrp 212
    network 192.168.60.0
    network 192.168.77.0
    no auto-summary

    On router 1

    router eigrp 212
    network 192.168.77.0

  4. Help?
    February 19th, 2013

    (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

    For this to work would it require us to issue the “redistribute static” command on R1? Then it will distribute the static route 0.0.0.0 0.0.0.0 198.0.18.5 to the other routers, so long as their interfaces are not passive.

    I can not get this to work with just the ip default-network command.

  5. zabeeh ullah
    February 19th, 2013

    Hy,
    what’s new changing in real Exam LAB acl2 and EIGRP.???

  6. Failed exam because of this question
    February 19th, 2013

    I took my exam on Feb 12th and I failed because I received this question as my second overall. I took up 25 minutes to figure it out. Do not let questions like this nab more than 7 total minutes of your time I would say. I immediately figured it out when I got home. Although the eigrp domain was different in the actual test, the lab here on 9tut is pretty spot on to what I received. Also, there are no debugs allowed as the commands are disabled in the test. You are very limited to what you can use for troubleshooting. If you use show run and show ip proto you should be able to find everything you need. Successful lab means you ping all routers from each other.

  7. craig baxter
    February 19th, 2013

    the sim for packet tracer doesnt work on upto date packet tracer?

  8. craig baxter
    February 19th, 2013

    never mind, my bad

  9. Anonymous
    February 19th, 2013

    @helper where did u get this in the exam?

  10. Arup
    February 19th, 2013

    @helper…you can not use “no network 198.0.198.0″ in R1.
    “network 198.0.198.0″ has to be there…..this command is used to propogate the ip default network information to routers R2,R3 &R4.

  11. Anonymous
    February 20th, 2013

    so now u people are basically trying to confuse everyone with all this shit,because u all don’t know what u are talking about.

  12. saaf
    February 20th, 2013

    im finish in the exam write all of command
    but when i need save the config he show
    distination file why ?
    i press enter
    return
    distination file why ???

  13. Light
    February 20th, 2013

    Some individuals stated they removed a phantom network that was not suppose to be in the central router. How would i know a network was not suppose to belong? Will it be based off the network map statements? For example, router 1 lists four known networks. Would a phantom network be 192.168.50.2 based according to R1′s network statement? Thanks

  14. DON
    February 21st, 2013

    I have a question is there are 2 EIGRP questions like 212 and 112
    if so what is the conflagration differences.

    And do i need to remove the passive interface serial1/0 or not because comments have different type of answers

    Some one please help me in this matter im going to take the exam in next march
    thnxx

  15. Jam
    February 21st, 2013

    Hello, people!
    I am confused about IP addressing scheme I saw in given PacketTracer EIGRP sim file.
    For example, lets consider address: 192.168.36.13 255.255.255.252.
    Show running-config gives us information about EIGRP advertized networks and their wildcard masks, as follows: network 192.168.36.13 0.0.0.127.
    I think the wildcard mask is wrong. It should be 0.0.0.3.
    Please correct me if I wrong or give me asmission.
    Thanks.

  16. softwil
    February 21st, 2013

    plz can anyone give me another site like this for training huawei certifications. thks!

  17. khan
    February 21st, 2013

    implement and verify WAN links i got 33% is a simulation in real exame guyz plzzz help.

  18. khan
    February 21st, 2013

    i took the the test on 19th scored 788/100
    1-describe how a network works………………………………75%
    2-configure, verify and troubleshoot a switch with VLANs and interswitch communic………………71%
    3-implement an ip addressing scheme and ip service to meet network requ…………..100%
    4-configure, verify and troubleshoot basic routeropration…………………….62%
    5-explain and select the appropriate admin…. task required for a WLAN………………..100%
    6-identify security threats to a network and describe genral method to mitigate those threats…….67%
    7-implement,verify and troubleshoot NAT and ACLs in a medium-size Ent branch office network……….60%
    8-implement and verify WAN links…………..33%

    guyz which indicats sims plzzzz help……..

  19. Anonymous
    February 21st, 2013

    @Khan u won’t find much help here with that score,it is becoming more confusing asking questions here.I had the same score in the WAN section and I still can’t figure out what I did wrong with all the commotion here now.the people that are passing can’t even figure out themselves because they were too busy cramming the entire site,60% in the WAN section you would have passed,the securing threat section is security and i think you might have gotten a few drag and drop on this also.the problem we are not getting help with the eigrp here it is just garbage talk all day.

  20. Anonymous
    February 21st, 2013

    there are people here trying to figure shit thats not even on the exam.

  21. Khan
    February 21st, 2013

    @anonymouse thank u buddy…. I was just trying to figur out if wan bit was the simiulation. I did get Eigrp, vtp and ACL 2. Is there any deduction if I don’t run commands in VTP???

  22. Anonymous
    February 21st, 2013

    @Khan nope the reason i am saying is because for some of my questions in the vtp SIM I just answered what I read on here,because I was pressing for time.and alot of people do not realize in the US we have 90 minutes outside of the us you get 2 hrs,i guess in the us CISCO realize we are more wealthy,since people are paying 500 dollars for a cell phone,they might as well make it 600 dollars for the certification.and more people are failing in the US no matter what.

  23. Gundam
    February 22nd, 2013

    I will take my exam next week feb. 27, 2013

    Hi everyone just want to ask about eigrp sim how do you test the sim if it is working? do i need to assign manually an ip address in each PC to ping another PC in other routers?

    Thanks in advance.

  24. zeeka
    February 23rd, 2013

    whats mean guys by phantom network ?
    any help

  25. StudyMan
    February 25th, 2013

    @zeeka
    What they mean by “Phantom network” is a network that should not be there. A random addition and is not needed and probably creates a security risk.

  26. jake.ph
    February 25th, 2013

    i got some questions, is this sim not a multiple choice question, meaning we have
    to execute the commands? what if i enter some unnecessary command would it be a deduction?

  27. I PASSED
    February 26th, 2013

    Hey guys,
    I took the test today and passed with a 896 (i wanted to hit 900 so bad, but i will take it). The intro said i need a 825 to pass. I took the first 15mins to write out my subnets from 250.0.0.0 /8 to 255.255.255.252/30. That help me all with the IP questions. The lab are just like the ones here. I got VTP, EIGRP (as was 221) and ACL2 ( i had to allow A to the web server and block all the others). I also use Sekhar.697q for vce. And in the eigrp and acl lab I could use “?” and “tab”. I saw a lot of those question but the answers are worded differently. So don’t memorize the answer.
    Thanks 9tut, I would of not of passed with out you. Good Luck everyone

    Jake.ph,
    When i was doing the ACL lab i mess up and didn’t use a deny statement and I saved the config and all. When i saw my mistake I changed the permit to a deny and saved the config again. I got 100% on that lab. So for my entering the wrong commands didn’t deduct for me. Hope that helps. Sorry about the long post. Just try to help like others did for me.

  28. jake.ph
    February 26th, 2013

    congrats to I PASSED, what’s the outline of the test was it random, meaning theories then inserted with simulations?

  29. Anonymous
    February 26th, 2013

    @helper , i think that is why the passive-interface is used between R1 and the ISP , even though 198.0.18.0 in in EIGRP 212 , EIGRP is not advertised on that network because of passive interface command , correct me if im wrong ,

  30. Anonymous
    February 26th, 2013

    @ I Passed
    good point letting people know what they can actually do before the exam,write down your commands,be ready for subnetting questions.you write down the access-list,eigrp and VTP,commands.

  31. peter
    February 26th, 2013

    @Anonymous roughly how many subnetting questions did you’ve and are they class A, B, or C thank you?

  32. Test Taker
    February 27th, 2013

    I passed yeterday with 881. Had EIGRP, VTP and ACL (allow host B web access to financial server while blocking all others from core and lan to finance server completely, all other traffic permitted). Used labs from 9tut (very legit), .VCE’s from http://www.examcollection.com, and the CCNA study guide by Todd Lammle (SYBEX).

  33. saaf
    February 27th, 2013

    i apply the exam yesterday and i solve the same questions bt i take 40% why ???

    tell me plzzz

  34. saaf
    February 27th, 2013

    hi test taker
    yesterday i apply the exam but i take 40 % in eigrp the same qustions here why??

  35. saaf
    February 27th, 2013

    can any one help me ???

  36. rockercya
    February 28th, 2013

    @saaf , did you do exactly as shown in the 9tut sim? were you able to save the confiiguration after doing all the changes ?

  37. saaf
    February 28th, 2013

    yeh i do the same i sure
    the same question
    save confiquration

  38. saaf
    February 28th, 2013

    why the problem ??

  39. pranshu
    February 28th, 2013

    @admin
    above packet tracer files are not working with the current version of cisco packet tracer i am having rit now.

    Please provide normal files which were there b4.

  40. saaf
    February 28th, 2013

    hi
    what the advantages of layer 2 ethernet switches over hubs ??????

  41. ellie
    February 28th, 2013

    I solved this sim, if i know how to solve this sim.. is it ok on exam.
    I just worried 9tut has only 1 sim for eigrp.

  42. CCNA
    February 28th, 2013

    @ellie
    if u know how to do it 100% then share it plzzzz..

  43. saaf
    February 28th, 2013

    i take exam and the lab the eigrp but i take 40% why ??

  44. saaf
    March 1st, 2013

    i practice in paket
    im sranger from 40%

    40% onely lab or lab with multiple options ??

  45. pranshu
    March 1st, 2013

    @9tut
    above packet tracer files are not working with the current version of cisco packet tracer i am having rit now.

    Please provide normal files which were there b4.
    Or tell which version 2 download.
    Please help,its urgent.Exam on 7march!!!!!!!!!!

  46. pranshu
    March 1st, 2013

    @9tut

    Above given files of EIGRP sim are compatible with which version of cisco packet tracer ???

  47. saaf
    March 1st, 2013

    no need passive here in eigrp ??

  48. pranshu
    March 1st, 2013

    @saaf
    you have you checked connectivity from R3,R4,R2 to ISP???

  49. saaf
    March 1st, 2013

    i check connect between routers pin but the ping time request out why ???
    i write the same commands here the same eigrp here
    ??????

  50. pranshu
    March 1st, 2013

    @saaf
    did u gave default network command on r1 for connectivity to isp

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