Which command do you enter to enable authentication for OSPF on an interface?
A. router(config-if)#ip ospf message-digest-key 1 md5 CISCOPASS
B. router(config-router)#area 0 authentication message-digest
C. router(config-router)#ip ospf authentication-key CISCOPASS
D. router(config-if)#ip ospf authentication message-digest
Answer:D
Which command do you enter to enable authentication for OSPF on an interface?
A. router(config-if)#ip ospf message-digest-key 1 md5 CISCOPASS B. router(config-router)#area 0 authentication message-digest C. router(config-router)#ip ospf authentication-key CISCOPASS D. router(config-if)#ip ospf authentication message-digest