What are the minimal configuration steps that are required to configure EIGRP HMAC-SHA2
authentication?
A.
classic router mode, interface XX, authentication mode hmac-sha-256 <password>
B.
named router mode, address-family statement, authentication mode hmac-sha-256 <password>
C.
named router mode, address-family statement, af-interface default, authentication mode hmacsha-256 <password>
D.
named router mode, address-family statement, authentication mode hmac-sha-256 <password>
HMAC-SHA only supported in named EIGRP mode. Must at least get to an interface context, thus you have to get to at least the default interface context under the named mode.
Add-on, example for the config
Router eigrp test
address-family ipv4 autonomous-system 45000
af-interface Ethernet 0/0
authentication mode hmac-sha-256 0 password1
end
1. under name mode
2. af-interface
Answers B and D are the same.