Which command verifies phase 1 of an IPsec VPN on a Cisco router?

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Which command verifies phase 1 of an IPsec VPN on a Cisco router?
A . show crypto map
B . show crypto ipsec sa
C . show crypto isakmp sa
D . show crypto engine connection active

Answer: C

Explanation:

A show crypto isakmp sa command shows the ISAKMP SA to be in MM_NO_STATE. This also means that main mode has failed.

Dstsrc state conn-id slot