Cisco Certified Network Associate (CCNA) Practice Exam

Which command shows neighbors in an OSPFv3 network and information about those routers?

1. show ipv6 ospf neighbors

2. show ipv6 eigrp neighbors

3. show ipv6 eigrp interfaces

4. show ipv6 protocols

The correct answer is: show ipv6 ospf neighbors

The command that displays neighbors in an OSPFv3 network along with information about those routers is "show ipv6 ospf neighbors." This command is specifically designed for use with OSPFv3, which is the version of Open Shortest Path First (OSPF) that supports IPv6. When you execute "show ipv6 ospf neighbors," the output provides crucial details such as the router IDs, states of the OSPF neighbors, and their respective interfaces. This information is essential for network administrators to troubleshoot and verify OSPFv3 connectivity and neighbor relationships, ensuring that routers can successfully exchange routing information. The other commands listed do not apply to OSPFv3. For instance, "show ipv6 eigrp neighbors" is related to the Enhanced Interior Gateway Routing Protocol (EIGRP) and would not provide any OSPF-related information. Similarly, "show ipv6 eigrp interfaces" is specific to EIGRP as well, focusing on interface details rather than neighbor relationships. Lastly, "show ipv6 protocols" describes IPv6 routing protocols in general but does not specifically focus on OSPFv3 neighbor relations. Therefore, the command for OSPFv3 neighbor information must be "