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17/08/2015 CCNA Training » OSPF Neighbor Sim
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OSPF Neighbor SimOctober 6th, 2014 Go to comments
Question
The topology below is running OSPF. You are required to troubleshoot and resolve the OSPF issuesbetween the various routers. Use the appropriate show commands to troubleshoot the issues.
Instead of posting the output of “show run” commands we post here the commands entered on eachrouter to reduce some useless lines. Also you can try solving questions by yourself before reading theanswers.
R1interface Loopback0 description ***Loopback*** ip address 192.168.1.1
R2!interface Loopback0 description **Loopback**
R3username R6 passwordCISCO36!interface Loopback0 description **Loopback** ip address 192.168.3.3255.255.255.255 ip ospf 3 area 0!interface Ethernet0/0 description **Connected toL2SW** ip address 10.10.230.3255.255.255.0
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255.255.255.255 ip ospf 1 area 0!interface Ethernet0/0 description **Connected to R1LAN** ip address 10.10.110.1255.255.255.0 ip ospf 1 area 0!interface Ethernet0/1 description **Connected toL2SW** ip address 10.10.230.1255.255.255.0 ip ospf hellointerval 25 ip ospf 1 area 0!router ospf 1 logadjacencychanges
ip address 192.168.2.2255.255.255.255 ip ospf 2 area 0!interface Ethernet0/0 description **Connected to R2LAN** ip address 10.10.120.1255.255.255.0 ip ospf 2 area 0!interface Ethernet0/1 description **Connected toL2SW** ip address 10.10.230.2255.255.255.0 ip ospf 2 area 0!router ospf 2 logadjacencychanges
ip ospf 3 area 0!interface Serial1/0 description **Connected to R4Branch1 office** ip address 10.10.240.1255.255.255.252 encapsulation ppp ip ospf 3 area 0!interface Serial1/1 description **Connected to R5Branch2 office** ip address 10.10.240.5255.255.255.252 encapsulation ppp ip ospf hellointerval 50 ip ospf 3 area 0!interface Serial1/2 description **Connected to R6Branch3 office** ip address 10.10.240.9255.255.255.252 encapsulation ppp ip ospf 3 area 0 ppp authentication chap!router ospf 3 routerid 192.168.3.3!
R4!interface Loopback0 description **Loopback** ip address 192.168.4.4255.255.255.255 ip ospf 4 area 2!interface Ethernet0/0 ip address 172.16.113.1255.255.255.0 ip ospf 4 area 2!interface Serial1/0 description **Connected to R3Main Branch office** ip address 10.10.240.2255.255.255.252 encapsulation ppp ip ospf 4 area 2!
R5!interface Loopback0 description **Loopback** ip address 192.168.5.5255.255.255.255 ip ospf 5 area 0!interface Ethernet0/0 ip address 172.16.114.1255.255.255.0 ip ospf 5 area 0!interface Serial1/0 description **Connected to R3Main Branch office** ip address 10.10.240.6255.255.255.252 encapsulation ppp ip ospf 5 area 0!
R6username R3 passwordCISCO36!interface Loopback0 description **Loopback** ip address 192.168.6.6255.255.255.255 ip ospf 6 area 0!interface Ethernet0/0 ip address 172.16.115.1255.255.255.0 ip ospf 6 area 0!interface Serial1/0 description **Connected to R3Main Branch office** ip address 10.10.240.10255.255.255.252 encapsulation ppp ip ospf 6 area 0 ppp authentication chap
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router ospf 4 logadjacencychanges
router ospf 5 logadjacencychanges
!router ospf 6 routerid 192.168.3.3!
Note: Packet Tracer does not support enabling OSPF under interface mode (ip ospf 3 area 0). Wedon’t know why such a popular command is not supported so we can’t make a pkt file for this lab.
Question 1
Explanation
We learned it is a OSPF problem so we should check the interfaces between them first. On both R3and R4 use “show runningconfig” command to check their S1/0 interfaces
R3#show runningconfig<<output omitted>>!interface Serial1/0 description **Connected to R4Branch1 office** ip address 10.10.240.1 255.255.255.252 encapsulation ppp ip ospf 3 area 0!<<output omitted>>
R4#show runningconfig<<output omitted>>!interface Serial1/0 description **Connected to R3Main Branch office** ip address 10.10.240.2 255.255.255.252 encapsulation ppp ip ospf 4 area 2!<<output omitted>>
In the output above we see their Area IDs are mismatched; interface S1/0 of R3 is in area 0 (R3: ipospf 3 area 0) while interface s1/0 of R4 is in area 2 (R4: ip ospf 4 area 2).
Question 2
Explanation
Continue checking their connected interfaces with the “show runningconfig” command:
R3#show runningconfig<<output omitted>>!interface Serial1/1 description **Connected to R5Branch2 office** ip address 10.10.240.5 255.255.255.252 encapsulation ppp ip ospf hellointerval 50
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ip ospf 3 area 0!<<output omitted>>
R5#show runningconfig<<output omitted>>!interface Serial1/0 description **Connected to R3Main Branch office** ip address 10.10.240.6 255.255.255.252 encapsulation ppp ip ospf 5 area 0!<<output omitted>>
The only difference we can see here is the line “ip ospf hellointerval 50″ on R3. This command setsthe number of seconds R3 waits before sending the next hello packet out this interface. In this caseafter configuring this command, R3 will send hello packets to R5 every 50 seconds. But the defaultvalue of hellointerval is 10 seconds and R5 is using it. Therefore we can think of a hello intervalmismatch problem here. You can verify with the “show ip ospf interface <interface>” command oneach router.
R3#sh ip ospf int s1/1Serial1/1 is up, line protocol is up Internet Address 10.10.240.5/30, Area 0 Process ID 3, Router ID 192.168.3.3, Network Type POINT_TO_POINT, Cost: 64 Enabled by interface config, including secondary ip addresses Transmit Delay is 1 sec, State POINT_TO_POINT, Timer intervals configured, Hello 50, Dead 200, Wait 200, Retransmit 5 oobresync timeout 200 Hello due in 00:00:28 Supports Linklocal Signaling (LLS) Index 2/2, flood queue length 0 Next 0x0(0)/0x0(0) Last flood scan length is 0, maximum is 0 Last flood scan time is 0 msec, maximum is 0 msec Neighbor Count is 0, Adjacent neighbor count is 0 Suppress hello for 0 neighbor(s)
R5#sh ip ospf int s1/0Serial1/0 is up, line protocol is up Internet Address 10.10.240.6/30, Area 0 Process ID 5, Router ID 10.10.240.6, Network Type POINT_TO_POINT, Cost: 64 Enabled by interface config, including secondary ip addresses Transmit Delay is 1 sec, State POINT_TO_POINT, Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 oobresync timeout 40 Hello due in 00:00:04 Supports Linklocal Signaling (LLS) Index 1/1, flood queue length 0 Next 0x0(0)/0x0(0) Last flood scan length is 0, maximum is 0 Last flood scan time is 0 msec, maximum is 0 msec Neighbor Count is 0, Adjacent neighbor count is 0 Suppress hello for 0 neighbor(s)
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So we can see both hello and dead interval are mismatched because the dead interval always fourtimes the value of hello interval, unless you manually configure the dead interval (with the ip ospfdeadinterval <seconds> command).
Question 3
Explanation
Continue checking their connected interfaces with the “show runningconfig” command:
R1#show runningconfig<<output omitted>>!interface Ethernet0/1 description **Connected to L2SW** ip address 10.10.230.1 255.255.255.0 ip ospf hellointerval 25 ip ospf 1 area 0!<<output omitted>>
R2#show runningconfig<<output omitted>>!interface Ethernet0/1 description **Connected to L2SW** ip address 10.10.230.2 255.255.255.0 ip ospf 2 area 0!<<output omitted>>
We see the hello interval on R1 is not the same as R2 (and you can verify with the “show ip ospfinterface <interface> command”) > There is a hello and dead interval mismatch problem. We shouldconfigure “no ip ospf hellointerval 25″ on R1.
Note: Maybe there are some versions of this question in the exam. For example there are some reportssaying that Ethernet0/1 on R1 is shutdown (and this is the correct choice in the exam). So please becareful checking the config on the routers before choosing the correct answers.
Question 4
Explanation
R3#show runningconfig<<output omitted>>username R6 password CISCO36!interface Serial1/2 description **Connected to R6Branch3 office** ip address 10.10.240.9 255.255.255.252 encapsulation ppp ip ospf 3 area 0 ppp authentication chap
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!<<output omitted>>!router ospf 3 routerid 192.168.3.3!<<output omitted>>
R6#show runningconfig<<output omitted>>username R3 password CISCO36!interface Serial1/0 description **Connected to R3Main Branch office** ip address 10.10.240.10 255.255.255.252 encapsulation ppp ip ospf 6 area 0 ppp authentication chap!<<output omitted>>!router ospf 6 routerid 192.168.3.3!<<output omitted>>
We are not sure about the configuration of ppp authentication in this case. Some reports said that onlyone router has the “ppp authentication chap” command but it is just a trick and is not the problemhere. The real problem here is R6 uses the same routerid of R3 (192.168.3.3) so OSPF neighborshipcannot be established. In real life, such configuration error will be shown in the command lineinterface (CLI). So please check carefully for this question.
Comments (278) CommentsComment pages« Previous 1 … 4 5 6 2243
1. AnonymousJuly 16th, 2015
Hi! Could someone please share the latest CCNA dumps…Email: [email protected]
Your kindness will be much appreciated.
2. ClaireJuly 16th, 2015
Hiii! Admin, the questions link provided isn’t working. Someone kindly share the latest [email protected]
3. 9tutJuly 18th, 2015
@Claire: Please use this link instead:http://www.4shared.com/office/Iz0lRRFLba/CCNAquestions_Jul_7_2015.html
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4. GregJuly 20th, 2015
Will someone please send the latest dumps or .pdf to [email protected]. Thank you somuch :)
5. DCJuly 20th, 2015
@ Claire: The linkhttp://www.4shared.com/office/Iz0lRRFLba/CCNAquestions_Jul_7_2015.html works well.Download with non priority, use facebook google+ , to count down the timer, then download it.I got success!
6. GinaHJuly 25th, 2015
How often does CCNA change their dumps??
7. srikanthJuly 26th, 2015
friends can u anybody send me ccna dumps i got exam on august
8. jayJuly 26th, 2015
hi..will some one share the latest dumps and VCE.email : [email protected]
9. CuriousJuly 26th, 2015
For Q3 , why is option D not correct?
10. CuriousJuly 26th, 2015
Also, is it enough if I just answer the questions? Do I have to correct the configurations too, bygoing into each router?
11. Jan MarieJuly 26th, 2015
Hi! Do you have Lab exercises that doesn’t have answers yet, like topology and only addressingscheme are in place and you have questions. :) Please send me some at [email protected]
Thanks in advance
12. CocngyaJuly 28th, 2015
Hi 9tut, can you please send me the latest dump at [email protected]
13. ArkaJuly 28th, 2015
17/08/2015 CCNA Training » OSPF Neighbor Sim
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@Curious – Cisco changes the questions, usually not the entire question but on a lot ofoccasions the numbers/ids/timer values – so to be on the safe side its important to read carefullyand verify the answers – if you do that, you will end up having up to go to the routers anyways.Else, if you just want to memorize, you can take that risk.
The initial scoresheet you get is actually a preliminary score (do not know how many peopleactually get a different score card or has a pass turned over to fail, if at all), and the hall ismonitored – so, if you actually memorize really well and finish your exam in 20 minutes, andyour simulation responses are handed in correctly without actually going into therouter/switches, which, in theory, isn’t possible without sheer luck, then, there is a possibilitythat your test will stand out if Cisco performs a statistical analysis, and you may have yourresult overturned. Long story short – verify your answers!
14. AnonymousJuly 28th, 2015
Hello please any has VCE 4.2.1 mail me on [email protected]
15. AnonymousJuly 28th, 2015
hi, is there any changes in exam for icnd 200101? thanks
16. johnJuly 30th, 2015
hi guys.. could you plz send me the latest ccna (200120) dump to my below mail id.. becausei’m going to write my ccna certification exam on Aug 14th 2015.. please help me out..
17. AnonymousAugust 2nd, 2015
good morning , can any one send me last up dates of dump to email:[email protected] .
18. anonAugust 3rd, 2015
Please explain where are actual sims, on 9tut.net or 9tut.com?
19. BeginnerAugust 5th, 2015
Kindly share the latest dumbs please: [email protected]
20. AnonymousAugust 5th, 2015
Please send latest icnd1 & icnd2 dumps to [email protected]
21. AnonymousAugust 7th, 2015
please send me latest dumps.I badly need it now. [email protected]
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22. AKAugust 9th, 2015
Hi,Do we need to make the rectification as well OR we just need to answer after checking showrunningconfig command ??? Please
23. johnAugust 11th, 2015
hi guys.. plz send the latest CCNA lab simulations to my mail id
24. HichamAugust 11th, 2015
Hello everyone! I’m planning to take the exam next week! Could anyone be kind enough tosend me the latest dumps to [email protected] I’ll greatly appreciate it and may Godbless!
25. BarryAugust 12th, 2015
Hi, I am planning to take ccna exam next week, please share the latest dumps [email protected]
26. cherifAugust 12th, 2015
Hi 9tut, can you please send me the latest dump at [email protected]
27. AnonymousAugust 15th, 2015
is there Wireless q on recent CCNA exam
28. jodyAugust 17th, 2015
Can you please provide the questions as we need to know exactly whats being answered. Onlyanswered as being put on labs.
Please kindly assist.
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