Cisco Certified Network Associate (CCNA) Practice Exam

What is the command used to confirm that OSPF v. 3 hello and dead timers match between two routers?

1. show ipv6 ospf interface

2. show ipv6 ospf

3. show ipv6 ospf database

4. show ipv6 route

The correct answer is: show ipv6 ospf interface

The command to confirm that OSPFv3 hello and dead timers match between two routers is "show ipv6 ospf interface." This command displays detailed information about OSPFv3 interfaces, including the hello interval, dead interval, and other OSPF parameters. By examining the output of this command on both routers, you can verify that the configuration for these timers is consistent, which is crucial for OSPFv3 adjacency formation. If the hello and dead timers do not match between the routers, they will not be able to establish a neighbor relationship, leading to potential routing issues. The other choices provide useful information but do not specifically target the desired confirmation of hello and dead timers. "Show ipv6 ospf" gives a general overview of the OSPFv3 process but lacks detailed interface-specific information. "Show ipv6 ospf database" presents information about the OSPF database but does not reference timer settings. "Show ipv6 route" displays the routing table but has no relation to OSPF timer configurations. Thus, for checking OSPFv3 timer settings, the interface command is the most appropriate and informative choice.