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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. Diego R
    November 6th, 2012

    @Rashmi, i asume u are working with the 9tut sim in paket tracer. U are reaching 198.0.18.5 from R1, no beacouse the default route, just becouse it is directly connected. I meaning, if you go to the ISP router, and go to “show ip route”, i will see nothing, becouse u did not teach him nothing, just directly conected 198.0.18.4….so its imposible to for ISP router to respond pings from R2, R3 or R4. Just anyone correct me if im wrong. Good luck.

  2. waqas
    November 6th, 2012

    any body plz give me link of packet tracer updated version for these simulations??

  3. Erick Vargas
    November 6th, 2012

    Hi Friends

    Today y pass my examen 945/1000 the labs its eigrp acl2 and vtp the labs chang but its changed a bit but its the same the labs study friends and will feel very happiness when become a CCNA

    Thanks 9tut

    BYE

  4. ahmed
    November 6th, 2012

    Diego R Diego R
    you want to say,,we dont need ping isp(198.0.18.5) from R2,R3,R4?
    RIGHT?

  5. darkcloud13
    November 7th, 2012

    Erick Vargas ‘ ‘ congratulations u passed the exam today may i ask how many items ? someone told me that the exam has been updated from 50 items to 55 items is that true. . ?

  6. Yazan
    November 7th, 2012

    i passed the exam yesterday and passed with 933 points , the sim was ( eigrp , vtp file:/sim/80-ccna-vtp-sim-question.htm ) but with some changes in it …. the eigrp sim there was an additional network in the configuration that they are not wrote it in the requirements so u have to remove it from R1 router nd the rest was the same , the vtp sim they change the interfaces number in each vlan so u have to be sure before u answer …. gd luck :)))

  7. Yazan
    November 7th, 2012

    and ACL2 sim too .

  8. Yazan
    November 7th, 2012

    @darkcloud13 , i had just 50 questions and they was very easy 50 , hope to u the best :))) … thx 9tut .

  9. darkcloud13
    November 7th, 2012

    @yazan – my two friends failed the exam today due to new questions in the multiple choice. .
    what dumps did you study?
    . . mine was brar and sekhar dumps,

  10. JC
    November 7th, 2012

    Its necessary in EIGRP lab to reach ISP from R2,R3,R4????????

  11. Diego R
    November 7th, 2012

    @ahmed, for sure u can not reach it in the practice sim by 9tut. Maybe in the examn u can sucefully ping 198.0.18.5, but thats another history, another confiugration must be in the ISP router. I have the examn tomorrow, so im keeping practicing with the sims heres, everthing should be ok. Goood luck to all. Anyone can confirm the available “?” commmand???

  12. akkii
    November 7th, 2012

    if there is a passive interface between routers then how do we remove it. plez tell the exact command.

    interface fa0/1
    no passive interface

    i tried this command on packet tracer but it’s not working. plez help my exam is on friday

  13. Yazan
    November 7th, 2012

    @akkii

    Router(config)#router eigrp 1
    Router(config-router)#no passive-interface fastEthernet x

  14. akkii
    November 7th, 2012

    @yazan

    thnks..

  15. Yazan
    November 7th, 2012

    @akkii u r very welcome , i put the eigrp autonomous system number 1 as an example ,
    gd luck with ur exam .

  16. czzzzzzzzzzzzzzzzz
    November 7th, 2012

    plz some one give me link of packet tracer updated version for these sims

    thankz

  17. ahmed
    November 8th, 2012

    yazan
    in this question,,we use this command or not?
    Router(config)#router eigrp 1
    Router(config-router)#no passive-interface fastEthernet x
    ????????????????????????

  18. ahmed
    November 8th, 2012

    and when we must use it???
    please help me?

  19. Yazan
    November 8th, 2012

    @ahmed

    No we dnt use it, in this one we use if its was enabled , and u will see it like this if its

    enable router eigrp 212
    passive-interface FastEthernet0/0
    network 192.168.77.0
    network 198.0.18.0
    network 192.168.69.0
    network 192.168.36.0
    no auto-summary

    in show run command
    if the passive-inteface command are enable on f0/0 on R1 or f0/0 on R3 .

    and as i said b4 u have to put the eigrp autonomous system number as it required , in this example u put Router(config)#router eigrp 212
    Router(config-router)#no passive-interface fastEthernet x ( x is the interface number

  20. ahmed
    November 8th, 2012

    thank you man
    i understand
    you mean if i see (passive-interface FastEthernet0/0) in show run,,i need to remove it by writing(no passive-interface FastEthernet0/0)

  21. tai
    November 8th, 2012

    @ every body

    we need write comman : ip default-network 198.0.18.0
    Ip route 0.0.0.0 0.0.0.0 198.0.18.5

    is this true ???
    pls support me , i have exam on this mounth

  22. akkii
    November 8th, 2012

    @tai

    this command will allow ping from other routers to ISP but i think this is not the requirement or is it??? plez update asap….

  23. K33p3r
    November 8th, 2012

    Hey guys,

    I’ve just passed CCNA today with the score 907/1000. The labs were ACL2, EIGRP and VTP. There was only a slight difference from the ones shown here so learn those commands.
    The majority of the questions are found on 9tut and on the popular dumps like brar and sekhar.

    Good luck getting certified and the most important of all, learn don’t grind.

    K33p3r

  24. Yazan
    November 8th, 2012

    @ahmed
    yes :) …. gd luck .

  25. zimzim
    November 9th, 2012

    @ sam
    “An extra network to be removed”….there was a network o R1 that was advertised but when i check “sh ip route” it was not there and not connected to anything,,i checked every router but i didn’t find it,,,but it was advertised like all other on R1..

  26. zimzim
    November 9th, 2012

    @sam you go:

    # router eigrp 212
    #no network 192.168.62.0
    and continue advertising the network of the new added router
    #network 192.168.77.0
    #network 192.168.60.0
    #no auto-summary

  27. zimzim
    November 9th, 2012

    Remember to use all possible commands..eg sh ip int brief, sh run, sh ip route, i believe it add marks as part of verification,

  28. zimzim
    November 9th, 2012

    master all the drag and drop and understand their questions eg:when they ask you about source ip,source mac,destination mac and source mac ,understand where the packet comes from(source) and where its going(destination),,dont do vice versa due to cramming of that drag and drop,

  29. zimzim
    November 9th, 2012

    Good luck to all,,,don’t cram the sims know the syntax,you’ll never go wrong

  30. tai
    November 9th, 2012

    @akkii

    Tks , i think we no need use that command , beacause in the question they said ” are working properly. “

  31. Jim
    November 9th, 2012

    Guys,

    If you want to ping ISP router- ip address 198.0.18.5 from R2,R3,R4 , you should put static route on ISP router ip route 0.0.0.0 0.0.0.0 198.0.18.6. I did this and now I can ping ISP router from R2,R3,R4.

    Regards,

  32. Marlvin
    November 9th, 2012

    guyz can someone send me VCE files…thanx in advance am from Zimbabwe…email marlvinnicol@gmail.com

  33. Helena
    November 9th, 2012

    Hi,

    why do we publish the network 192.168.77.0 as if it was /24 bit,
    when the network is: 192.168.77.33 / 30 bit ?!

    Thanks in advance ! :)

  34. Yazan
    November 10th, 2012

    @Helena

    The network command by default takes “classful” networks. (WC mask missing form the command, EIGRP assumes “classful” network).

    The network statements in EIGRP serve a dual role, both defining which networks this router will distribute, and which interfaces will take part in the routing protocol. So the network 192.168.77.0 command in this example means that if this router has any interfaces that are directly connected to subnets of 192.168.77.0, then it will inject this information into the routing protocol. It also means that it will try to find EIGRP neighbor routers through these same interfaces.

  35. Yacoub
    November 10th, 2012

    guyz can someone send me VCE files…thanx in advance am from Zimbabwe…email yacoub9308@gmail.com

  36. tai
    November 10th, 2012

    @ hello all

    I still confuse with EIGRP lab , is this necessary use command
    ip default-network 198.0.18.0
    ip route 0.0.0.0 0.0.0.0 198.0.18.5

    in the exam ?

    beacause as i understand before add router 3 , all configuration are properly –> it mean that we only config EIGRP on R3 and R1

    that all !!!

    who person was passed ,please explain me ?? i have exam on 16th

    thank so much

  37. Yazan
    November 10th, 2012

    @tai

    no its not necessary , i didnt do it and i get 100% at this question in my exam , u have to check R1 and R3 just

  38. ahmad
    November 10th, 2012

    yazan
    i am very scared!!!!!!!!!
    my exam in 13-11
    and i open website(www.howtonetwork.net)
    and i see question (the 1st time i see it)
    what do you say?
    anoher thing:
    sekhher and brar + the sim on 9 tut enough…
    please help me man…what i can do??

  39. ahmad
    November 10th, 2012

    #copy run start
    or
    #copy running-config startup-config
    all these command will save the configuration???????

  40. Yazan
    November 11th, 2012

    @ahmad

    dnt be scared coz if there is a new question it will be the same as what u studied b4 nthn more nthn less and trust me i was scared b4 my exam but when i saw the 1st question and saw how easy its i felt comfortable .

    and i dnt know about that dump , coz my dump was http://www.examcollection.com/cisco/Cisco.BrainDump.640-802.v2012-08-27.by.Anonymous.632q.vce.file.html

    and from comments this still valid , see the comments when u open the link .

    i hope u will pass , best wishes :)))

  41. Yazan
    November 11th, 2012

    @ahmad

    and yes coz copy run start its copy running-config startup-config

    try to write (# copy run ) and then press tab key then press (start) then the tab key and u will see .

    there is another command to save the configuration but its not valid in the exam its for real life ( #wr ) DONT USE IT AT THE EXAM

  42. ahmad
    November 11th, 2012

    realy,,thank you man>>
    thank you yazan
    thaaaaaaaaaaaaaaaaaaaaaaaaaaaaank yooooooooooooou

  43. ahmad
    November 11th, 2012

    yazan i am studied the same dump…….

  44. tai
    November 11th, 2012

    @Yazan

    Thank so much ,

  45. Yazan
    November 11th, 2012

    @all
    u are very welcome guy’s , just plz dnt fail coz its rly easy exam :)

  46. zim zim
    November 11th, 2012

    all the dumps are the same,they are just sub-divided differently and may be 2 additional questions

  47. Anonymous
    November 11th, 2012

    Hi friends, My exam on on the 21st November
    Can any one help me with the dumps and simulation with what is similar to the exams please

    If you can email me yacoub9308@gmail.com

    I would like to thank you so much HELP ME PLEASE!!!

  48. ahmad
    November 11th, 2012

    okay yazan
    thank you

  49. Basti
    November 11th, 2012

    Guyz can someone help me on eigrp lab. I failed my ccna exam :(
    I only got 69% on eigrp lab. However I am very confident that I
    configured properly. I can ping all the routers.

    Here is the scenerio:
    Home1 router, Field1 and Field2 are properly configured.
    All other inter connectivity and Internet access for the existing locations of the company are working properly.
    Home2 is the new added router. I changed the AS number for the new router and re-configured the network. And I added a missing
    network on Home1 router. And one more thing I removed the extra network on Home1 and that extra network is not connecting to anything.
    I tested between router to router and all routers are pingable. Note: I used the no-auto summary and copy run start.
    Please can anybody explain why I got 69% ? Thanks. .

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