Cisco Certified Network Associate (CCNA) Practice Exam

Which command checks if Hello and Dead timers match in an OSPFv3 network?

1. #show ipv6 ospf neighbors

2. #show ipv6 ospf interface

3. #show ipv6 sessions

4. #show ipv6 timer

The correct answer is: #show ipv6 ospf interface

In an OSPFv3 network, the command that specifically checks the Hello and Dead timers for OSPF neighbors is the one that displays OSPF interface information. This command provides details about the OSPFv3 configuration on the interface level, including the current settings for the Hello and Dead intervals. OSPF relies on these timers to maintain neighbor relationships, and any mismatch in these values can lead to adjacency issues. Using the command related to OSPF interfaces allows you to directly view the timer settings associated with each OSPFv3-enabled interface, making it easier to troubleshoot any potential connectivity or adjacency problems related to these timers. The other options do not provide the timer information needed to confirm if they match among OSPFv3 neighbors. For example, while some commands might show neighbor relationships or general sessions, they do not specifically provide the timer interval information necessary for verification.