A network engineer is implementing security on all company routers. Which two commands must be issued to force authentication via the password 1A2b3C for all OSPF-enabled interfaces in the backbone area of the company network? (Choose two.)
- area 0 authentication message-digest
- ip ospf message-digest-key 1 md5 1A2b3C
- username OSPF password 1A2b3C
- enable password 1A2b3C
- area 1 authentication message-digest
Explanation: The two commands that are necessary to configure authentication via the password 1A2b3C for all OSPF-enabled interfaces in the backbone area (Area 0) of the company network would be ip ospf message-digest-key 1 md5 1A2b3C and area 0 authentication message-digest. The option area 1 authentication message-digest is incorrect because it refers to Area 1, not Area 0. The option enable password 1A2b3C is incorrect because it would set the privileged EXEC mode password instead of the OSPF authentication password. The option username OSPF password 1A2b3C is required to create a username database in a router, which is not required with OSPF authentication.