Cisco Certified Network Associate (CCNA) Practice Exam

To ensure OSPF v. 3 routers can form a neighborship, which command confirms that protocol authentication is passing?

1. show ipv6 ospf

2. show ipv6 ospf database

3. show ipv6 ospf interface

4. show ipv6 route

The correct answer is: show ipv6 ospf interface

The command that confirms OSPFv3 router authentication is indeed the one that checks the interfaces running OSPFv3. By using this command, you can review the OSPF interface settings and see if authentication configurations are correctly applied and operational. This includes authentication type, which may be critical for ensuring that routers can communicate and form neighbor relationships securely. Authentication ensures that only trusted routers can become part of the OSPFv3 routing domain, which is essential for maintaining the integrity of the OSPF routing process and preventing unauthorized access. If authentication was not passing, you would not see the appropriate neighbors being formed or maintained on that interface. The other commands do provide useful OSPF information, but they focus on different aspects. One command gives an overview of OSPF settings, another provides details about the OSPF database which includes routing information, and yet another shows the routing table rather than specific interface-level details about authentication. Thus, the command that examines interface settings is the most relevant for confirming whether OSPFv3 authentication is functioning as intended.