Cisco CCNA mock exam questions sample test – Question 451

.You have discovered that Router 8 on your network is not receiving updates from Router 10. Router10 has an IP address of 201.56.41.9. All routers run RIP. Since you are new and
not completely familiar with the topology of the network, you execute the debug ip rip command on Router 8 and receive the results shown below:
Router8# debug ip rip
*Mar 1 07:35:12.070: RIP: sending v2 update to 201.56.41.9 via Serial0/0 (201.56.41.88)
*Mar 1 07:35:12.074: RIP: build update entries
*Mar 1 07:35:19.638: RIP: ignored v2 packet from 201.56.41.9 (invalid authentication)
What can be the problem? (Choose all that apply.)

A. Router 10 has not yet been configured for authentication
B. Router 10 is configured for RIPv2 and Router 8 is configured for RIP v1.
C. There is a connectivity problem between the routers.
D. Router 10 is over 16 hops away
E. The password is not correct.

Correct Answer: AE

Explanation:
The problem can be that Router 10 has not yet been configured for authentication or that the password is not correct. This can be ascertained by the line in the debug output shown
below:
*Mar 1 07:35:19.638: RIP: ignored v2 packet from 201.56.41.9 (invalid authentication)
It is not a problem with RIP version mismatch. If that were the problem, the following statement would be a line in the output:
*Mar 1 07:35:19.638: RIP: ignored v2 packet from 201.56.41.9 (illegal version)
It is not a connectivity problem. If there were a connectivity problem, we would not be receiving an attempt at an update from Router 10.
Router 10 is not more than 16 hops away. If that were the case, that information would be received from another router in its updates as shown below:
*Mar 1 07:35:19.638: RIP: received update from 201.56.41.10 via Serial0/0
201.56.41.9 in 16 hops (inaccessible)
Objective:
Routing Fundamentals
Sub-Objective:
Configure, verify, and troubleshoot RIPv2 for IPv4 (excluding authentication, filtering, manual summarization, redistribution)
References:
Cisco IOS Debug Command Reference, Release 12.4 > Commands: debug ip http all through debug ip rsvp > debug ip rip