Scenario
Refer to the topology. Your company has decided to connect the main office with three other remote branch offices using point-to-point serial links.
You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices.
Use appropriate show commands to troubleshoot the issues and answer all four questions.
Instructions
* Enter Cisco IOS commands on the device to verify network operation and answer the multiple-choice questions.
* THIS TASK DOES NOT REQUIRE DEVICE CONFIGURATION.
* Click on the device to gain access to the console of the device. No console or enable passwords are required.
* To access the multiple-choice questions, click on the numbered boxes on the left of the top panel.
* There are four multiple-choice questions with this task. Be sure to answer all four questions before clicking the Next button.
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>
An OSPF neighbor adjacency is not formed between R3 in the main office and R5 in the Branch2 office. What is causing the problem?
| A. |
There is an area ID mismatch. | |
| B. |
There is a PPP authentication issue; a password mismatch. | |
| C. |
There is an OSPF hello and dead interval mismatch. | |
| D. |
There is a missing network command in the OSPF process on R5. |
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