An engineer has added the following configuration snippet to an implementation planning
document. The configuration will be added to Router R1, whose Fa0/0 interface connects to
a LAN to which Routers R2 and R3 also connect. R2 and R3 are already EIGRP neighbors
with each other. Assuming the snippet shows all commands on R1 related to EIGRP
authentication, which answer lists an appropriate comment to be made during the
implementation plan peer review?
key chain fred

key 3
key-string whehew
interface fa0/0
ip authentication key-chain eigrp 9 fred

A.
The configuration is missing one authentication-related configuration command.

B.
The configuration is missing two authentication-related configuration commands.

C.
Authentication type 9 is not supported; type 5 should be used insteaD.

D.
The key numbers must begin with key 1, so change the key 3 command to key 1.

Explanation:
The configuration requires the ip authentication mode eigrp asn md5 command,
which is currently missinG. This command enables MD5-style authentication, rather
than the default of no authentication. Adding this one command completes the configuration.
Any valid key numbers can be useD. Also, the 9 in the ip authentication
key-chain eigrp 9 fred command refers to the EIGRP ASN, not an authentication type.