Refer to the exhibit. Which command results in these messages when attempting to troubleshoot an IPsec VPN connection?

Question

Exhibit

Options

• Adebug crypto isakmp connection
• Bdebug crypto ipsec
• Cdebug crypto ipsec endpoint
• Ddebug crypto isakmp

• A
  2% (1)
• B
  5% (2)
• D
  93% (41)

Explanation

debug crypto isakmp is the valid Cisco IOS command that generates ISAKMP (Internet Key Exchange Phase 1) debug output - the messages shown in the exhibit reflect Phase 1 negotiation between VPN peers, including SA proposals, authentication exchanges, and key generation.

Why the distractors are wrong:

• A (debug crypto isakmp connection) - invalid syntax; no connection keyword exists in this command.
• B (debug crypto ipsec) - valid command, but it outputs Phase 2 (IPsec SA) negotiation messages, not Phase 1/ISAKMP messages.
• C (debug crypto ipsec endpoint) - invalid syntax; endpoint is not a valid keyword here.

Memory tip: Think of the two phases as a handshake then a tunnel - ISAKMP = Phase 1 (who are you? let's agree on keys), IPsec = Phase 2 (now let's encrypt the data). Use debug crypto isakmp to watch the handshake, debug crypto ipsec to watch the tunnel build. Match your debug command to the phase that's failing.

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