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Routers R1 and R2, OSPF neighbors in area0 over their Fa0/0 interfaces currently both successfully use OSPF MD5 authentication. The OSPF configuration includes the area0 authentication command under the router ospf1 command. Which of the following commands must have been configured on R1’s Fa0/0 interface?
a. ip ospf authentication null
b. ip ospf authentication message-digest
c. ip ospf authentication-key whatever-it-is
d. ip ospf message-digest-key1 md5 whatever-it-is
e. ip ospf md51 key whatever-it-is
you will butt under interface configuration
d. ip ospf message-digest-key1 md5 whatever-it-is
B and D. The area0 authentication command tells R1 to use simple text password authentication on all interfaces in area0 unless overridden by an interface subcommand. So, R1 must have configured the ip ospf authentication message-digest on its Fa0/0 interface, enabling MD5 authentication instead. The other correct answer is the command that correctly configures the MD5 authentication key. Of the two incorrect answers that list an authentication key, ip ospf authentication-key defines the clear-text key, and the other is not a valid IOS command.
My answer is d. ip ospf message-digest-key1 md5 whatever-it-is
i think the last one :e. ip ospf md51 key whatever-it-is
