What command is utilized to enable OSPF authentication on a router?

The command that is utilized to enable OSPF authentication on a router is "ip ospf authentication [type]." This command is essential for configuring the authentication method that OSPF will use to verify the integrity and authenticity of routing information exchanged between neighboring routers.

By specifying the authentication type (such as simple password or MD5), this command ensures that routers within the OSPF area can only exchange routing updates with other routers that share the same authentication parameters, thus enhancing security. The use of authentication prevents unauthorized routers from injecting false routing information into the network, which is crucial for maintaining a stable and secure OSPF environment.

This approach aligns with best practices for network security, especially in larger environments where multiple routers may interact, potentially increasing the risk of unauthorized access or exploitation.