What configure mode you used for the command ip ospf authentication-key c1$c0?

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What configure mode you used for the command ip ospf authentication-key c1$c0?
A . global
B . privileged
C . in-line
D . Interface

Answer: D

Explanation:

ip ospf authentication-key is used under interface configuration mode, so it’s in interface level, under global configuration mode. If it asks about interface level then choose that.

interface Serial0

ip address 192.16.64.1 255.255.25