Cisco Certified Network Associate (CCNA) Practice Exam

What is one way to check the OSPFv3 network topology?

1. #show ipv6 routers

2. #show ipv6 ospf database

3. #show ipv6 routing table

4. #show ospf metrics

The correct answer is: #show ipv6 ospf database

The correct choice is based on the fact that the command specifically targets the OSPFv3 protocol, which is used for IPv6 networks. By executing the command that displays the OSPF database, you are able to view the information about the OSPFv3 neighbors and the topology of the network. This database contains information about all OSPF routes, their states, and associated metrics, which is crucial for understanding how OSPFv3 is functioning within the network. The other commands, while related to OSPF and IPv6, do not provide a comprehensive view of the OSPFv3 network topology. For example, checking the routing table would give you an overview of the routing information but lacks the details specific to OSPFv3 topology and interactions among OSPF routers. Similarly, the command for OSPF metrics would provide some performance indications but not the full topology. The command showing IPv6 routers focuses on the discovery of neighboring devices but does not delve into the OSPF-specific information needed to fully understand the network layout. Thus, the command representing the OSPF database magnifies the overall OSPFv3 structure and relationships, making it the most suitable choice.