3 good questions and answers about "IS-IS - Authentication in IS-IS"

What are the commands to configure authentication for LAN IIH level 1/2?
(config-if)# isis authentication mode {text | md5} level-1/level-2
(config-if)# isis auth key-chain name level-1/level-2
What are the command to configure authentication for P2P IIH?
(config-if)#isis authentication mode {text | md5}
(config-if)#isis authentication key-chain name

So no difference between L1 & L2 hellos (p-2-p only using L1L2 hellos)
For what can IS-IS be authenticated?
-For IIH
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