OSPF Neighbor Sim
Question
The topology below is running OSPF. You are required to troubleshoot and resolve the OSPF issues between 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 each router to reduce some useless lines. Also you can try solving questions by yourself before reading the answers.
|
R1 |
R2 ! interface Loopback0 description **Loopback** ip address 192.168.2.2 255.255.255.255 ip ospf 2 area 0 ! interface Ethernet0/0 description **Connected to R2-LAN** ip address 10.10.120.1 255.255.255.0 ip ospf 2 area 0 ! interface Ethernet0/1 description **Connected to L2SW** ip address 10.10.230.2 255.255.255.0 ip ospf 2 area 0 ! router ospf 2 log-adjacency-changes |
R3 username R6 password CISCO36 ! interface Loopback0 description **Loopback** ip address 192.168.3.3 255.255.255.255 ip ospf 3 area 0 ! interface Ethernet0/0 description **Connected to L2SW** ip address 10.10.230.3 255.255.255.0 ip ospf 3 area 0 ! interface Serial1/0 description **Connected to R4-Branch1 office** ip address 10.10.240.1 255.255.255.252 encapsulation ppp ip ospf 3 area 0 ! interface Serial1/1 description **Connected to R5-Branch2 office** ip address 10.10.240.5 255.255.255.252 encapsulation ppp ip ospf hello-interval 50 ip ospf 3 area 0 ! interface Serial1/2 description **Connected to R6-Branch3 office** ip address 10.10.240.9 255.255.255.252 encapsulation ppp ip ospf 3 area 0 ppp authentication chap ! router ospf 3 router-id 192.168.3.3 ! |
| R4 ! interface Loopback0 description **Loopback** ip address 192.168.4.4 255.255.255.255 ip ospf 4 area 2 ! interface Ethernet0/0 ip address 172.16.113.1 255.255.255.0 ip ospf 4 area 2 ! interface Serial1/0 description **Connected to R3-Main Branch office** ip address 10.10.240.2 255.255.255.252 encapsulation ppp ip ospf 4 area 2 ! router ospf 4 log-adjacency-changes |
R5 ! interface Loopback0 description **Loopback** ip address 192.168.5.5 255.255.255.255 ip ospf 5 area 0 ! interface Ethernet0/0 ip address 172.16.114.1 255.255.255.0 ip ospf 5 area 0 ! interface Serial1/0 description **Connected to R3-Main Branch office** ip address 10.10.240.6 255.255.255.252 encapsulation ppp ip ospf 5 area 0 ! router ospf 5 log-adjacency-changes |
R6 username R3 password CISCO36 ! interface Loopback0 description **Loopback** ip address 192.168.6.6 255.255.255.255 ip ospf 6 area 0 ! interface Ethernet0/0 ip address 172.16.115.1 255.255.255.0 ip ospf 6 area 0 ! interface Serial1/0 description **Connected to R3-Main Branch office** ip address 10.10.240.10 255.255.255.252 encapsulation ppp ip ospf 6 area 0 ppp authentication chap ! router ospf 6 router-id 192.168.3.3 ! |
Note: Packet Tracer does not support enabling OSPF under interface mode (ip ospf 3 area 0). We don’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 R3 and R4 use “show running-config” command to check their S1/0 interfaces
| R3#show running-config <<output omitted>> ! interface Serial1/0 description **Connected to R4-Branch1 office** ip address 10.10.240.1 255.255.255.252 encapsulation ppp ip ospf 3 area 0 ! <<output omitted>> |
| R4#show running-config <<output omitted>> ! interface Serial1/0 description **Connected to R3-Main 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: ip ospf 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 running-config” command:
| R3#show running-config <<output omitted>> ! interface Serial1/1 description **Connected to R5-Branch2 office** ip address 10.10.240.5 255.255.255.252 encapsulation ppp ip ospf hello-interval 50 ip ospf 3 area 0 ! <<output omitted>> |
| R5#show running-config <<output omitted>> ! interface Serial1/0 description **Connected to R3-Main 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 hello-interval 50” on R3. This command sets the number of seconds R3 waits before sending the next hello packet out this interface. In this case after configuring this command, R3 will send hello packets to R5 every 50 seconds. But the default value of hello-interval is 10 seconds and R5 is using it. Therefore we can think of a hello interval mismatch problem here. You can verify with the “show ip ospf interface <interface>” command on each router.
| R3#sh ip ospf int s1/1 Serial1/1 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 oob-resync timeout 200 Hello due in 00:00:28 Supports Link-local 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 s1/0 Serial1/0 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 oob-resync timeout 40 Hello due in 00:00:04 Supports Link-local 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) |
So we can see both hello and dead interval are mismatched because the dead interval always four times the value of hello interval, unless you manually configure the dead interval (with the ip ospf dead-interval <seconds> command).
Question 3
Explanation
Continue checking their connected interfaces with the “show running-config” command:
| R1#show running-config <<output omitted>> ! interface Ethernet0/1 description **Connected to L2SW** ip address 10.10.230.1 255.255.255.0 ip ospf hello-interval 25 ip ospf 1 area 0 ! <<output omitted>> |
| R2#show running-config <<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 ospf interface <interface> command”) -> There is a hello and dead interval mismatch problem. We should configure “no ip ospf hello-interval 25” on R1.
Note: Maybe there are some versions of this question in the exam. For example there are some reports saying that Ethernet0/1 on R1 is shutdown (and this is the correct choice in the exam). So please be careful checking the config on the routers before choosing the correct answers.
Question 4
Explanation
| R3#show running-config <<output omitted>> username R6 password CISCO36 ! interface Serial1/2 description **Connected to R6-Branch3 office** ip address 10.10.240.9 255.255.255.252 encapsulation ppp ip ospf 3 area 0 ppp authentication chap ! <<output omitted>> ! router ospf 3 router-id 192.168.3.3 ! <<output omitted>> |
| R6#show running-config <<output omitted>> username R3 password CISCO36 ! interface Serial1/0 description **Connected to R3-Main 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 router-id 192.168.3.3 ! <<output omitted>> |
We are not sure about the configuration of ppp authentication in this case. Some reports said that only one router has the “ppp authentication chap” command but it is just a trick and is not the problem here. The real problem here is R6 uses the same router-id of R3 (192.168.3.3) so OSPF neighborship cannot be established. In real life, such configuration error will be shown in the command line interface (CLI). So please check carefully for this question.
Please send the latest dump!
freedomkull at gmail.com
Thanks
Please send the latest dump
Email:-
{email not allowed}
Please send the latest dump!
26s1272 at gmail dot com
Thanks
*PASSED CCNA 910 SCORE, Dump is valid best 20 buck*
Please stop asking to send dump! NO ONE WILL SEND IT the questions are right here to the right I Studied 70% of the questions did not have time for all of them but out of the 70% I studied I did get about 15 questions in the real exam.
SIM I got were:
ACL 1 and 2
RIP
And OSPF
Guys PLEASE Study all the questions they are to the right especially the “New Questions” STUDY all of them NEW and old and then due the test.
YES they are a lot of questions, but you have do to something cant get it all easy. STUDY read Memorize what ever.
AND STOP Spamming no one will send you anything!!!!!!!!!!!!!!!!!!!!
PASADO.
Pasaste?
mycertexam.com/blog/2020/01/08/cisco-latest-questions-answers/
for download Packet Tracer Labs and more
henry_mendozaa at hotmail dot com
For question 4, the show run command does not show much. Why not use:
on R3
sh ip ospf int s1/2
on R6
sh ip ospf int s1/0
these commands give you the router ID for the specific interfaces
please send latest bucket of KFC chicken. thanks.
Hello
I’m going to have CCNA 200-125 exam on January 24. I would be glad if you share with me the latest questions. Thanks in advance.
Please
oa554537 @ gmail . com
Passed
*Dump is valid best 20 buck*
Where?
the minimum that I have found is 89.99 euros for a month in avanset.
Where do I find him for 20 bucks?
Thanks
Hello
I have exam next week.would you please send me last questions.
saeid . nakhjavan @ gmail . com
Thank you
Onyone please forward latest CCNA dumps at t.kamidi at gmail dot com.
Can anyone forward latest CCNA dumps at hghiorsi at aol dot com. Thank you very much in advance.
Can anyone forward the lastest dump for 200-125? TIA
mouaxais AT gmail . com
Can anyone forward the lastest dump for 200-125? (anhaa 9991 at gmail dot com) Thank you I’m going to have CCNA 200-125 exam on January 23
Hello, guys. Can someone say where should i buy the most relevant dumps for my ccna? Kinda not sure about braindumps or examcollections. Thnx a lot
Do you really think these dumps work ?
Kindly send latest dumps for 200-125 at {email not allowed}.
thanks and regards.
Any word from those who just took it?
what is the question set up.
first 1-30 are objectives?
how many labs?
what is it like?
Please forward the latest dump to mar72603 at gmail dot com. Thank you I will be taking exam January 31st
your kind support to forward the latest dump to {email not allowed}
I failed my first attempt and I see this material very complete
Thanks!
Hello
Please CCNAv3 questions 7
Thanks
oa554537@gmail (.)com
Please send latest dumps. {email not allowed}
Thanks
Pls send latest dumps for 200-125 at RazorKDT at gmail dot com
Please send the latest dumps at {email not allowed}.
I have my exam next week ccna R&S
thanks
Please send the latest dumps at shahrukh_siddiqui12@outlook (. c o m )
I have my exam next week ccna R&S
thanks
Please send latest dumps at yasser _ ymn @ hotmail ( .com)
Thanks
iirc packet tracer 7.3.0 is able to do ospf interface mode
Please send the latest dumps at: saeid.nakhjavan @ gmail . com
I have my exam next week ccna R&S.
Thanks