Cisco Certified Network Associate (CCNA) Practice Exam

What command allows you to verify all routes learned by OSPF?

1. show ipv6 ospf routes

2. show ipv6 route

3. show ospf route

4. show route learned

The correct answer is: show ipv6 route

To verify all routes learned by OSPF, the command that is appropriate is indeed "show ipv6 route" for IPv6 routes or "show ip route" for IPv4 routes. This command provides an overview of the entire routing table, including routes learned through OSPF. When using "show ipv6 route," the router displays all available IPv6 routes, including those learned from OSPF, allowing you to see the OSPF routes alongside other routes from different protocols and static configurations. This broad view of the routing table is essential for troubleshooting and network verification, providing insight into how different routing protocols are contributing to the overall routing infrastructure. The other options are not appropriate for verifying OSPF routes specifically. "show ipv6 ospf routes" is not a valid command in Cisco devices, while "show route learned" does not exist in Cisco command syntax. Similarly, "show ospf route" lacks the correct syntax as there is no standalone command for that purpose. Therefore, focusing on the routing table via "show ipv6 route" is the best way to verify OSPF-learned routes.