mediumMultiple Choice
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show crypto isakmp sa
dst src state conn-id slot status
10.1.1.2 10.1.1.1 MM_ACTIVE 1 0 ACTIVE 10.1.1.3 10.1.1.1 MM_ACTIVE 2 0 ACTIVE
Based on this output, which statement is correct?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
IKE phase 1 is complete for both peers.
The show crypto isakmp sa command shows IKE phase 1 security associations. The state MM_ACTIVE indicates that IKE phase 1 is complete and active. The output shows two active SAs with the local router (10.1.1.1) and two remote peers (10.1.1.2 and 10.1.1.3).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
IKE phase 1 is complete for both peers.
Why this is correct
MM_ACTIVE is the main mode state indicating IKE phase 1 security associations are established. Both peer entries show this state, confirming phase 1 completed for each peer; phase 2 quick mode is a separate negotiation.
- ✗
IKE phase 2 is complete for both peers.
Why it's wrong here
MM_ACTIVE denotes main mode IKE phase 1 completion, confirming the ISAKMP security association is established; phase 2 is negotiated separately via quick mode and shown by IPSec SA output. It is tempting because MM_ACTIVE sounds like full tunnel establishment, and would be correct if the output displayed QM_IDLE.
- ✗
The IPsec tunnels are established.
Why it's wrong here
MM_ACTIVE only proves phase 1 ISAKMP is up; IPsec SAs require a separate 'show crypto ipsec sa' with inbound and outbound ESP entries. It is tempting because phase 2 cannot form without phase 1, so active ISAKMP is a prerequisite, but it is not the tunnel itself.
- ✗
The peers are not responding.
Why it's wrong here
MM_ACTIVE confirms both peers completed main mode and are responding; the state would show MM_NO_STATE or MM_KEY_EXCH if replies were missing. It is tempting because a peer that stops replying does leave a stale SA, but that appears as a timed-out or deleted entry, not two active ones.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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