An administrator is troubleshooting connectivity between two routers configured with EIGRPv6. The routing table, for both the respective routers, displays all the advertised networks and the authentication parameters for key ID and the key string match. Unfortunately, authentication fails between the two routers. What is a possible cause?

IT Questions Bank › Category: CCNP › An administrator is troubleshooting connectivity between two routers configured with EIGRPv6. The routing table, for both the respective routers, displays all the advertised networks and the authentication parameters for key ID and the key string match. Unfortunately, authentication fails between the two routers. What is a possible cause?

Question:

a passive interface present on one of the routers
mismatched valid times
improperly configured timers.
IPv6 not enabled on one connected interface

Explanation: For successful authentication, the key ID and key string must match. Timers do not have to match. However, if they are not configured appropriately, neighbor relationships might flap resulting in unsuccessful authentication.

Exam with this question: CCNP ENARSI 8 Modules 1 - 5 Checkpoint Exam: Routing Concepts and EIGRP Exam