The correct conclusion is that IKE Phase 1 is in progress but not yet complete. The MM_NO_STATE state in the show crypto isakmp sa output indicates that the Internet Key Exchange (IKE) negotiation has stalled at the very beginning of Main Mode, meaning the router has sent its initial proposal but has not received a valid response from the remote peer at 10.1.1.2. This typically occurs because the remote peer is unreachable, the ISAKMP policy parameters (such as encryption, hash, or authentication method) do not match, or a firewall is blocking UDP port 500. On the ENCOR 350-401 exam, this output tests your ability to interpret IKE Phase 1 states and troubleshoot VPN establishment failures. A common trap is confusing MM_NO_STATE with a completed Phase 1 state like MM_ACTIVE; remember that any state containing "NO_STATE" or "MM" without "ACTIVE" means the tunnel is not yet operational. Memory tip: "MM_NO_STATE means no partner to negotiate with."
CCNP VPN Technologies Practice Question
This 350-401 practice question tests your understanding of vpn technologies. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer runs the following command on Router R1:
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 in progress but not yet complete.
The MM_NO_STATE indicates that the IKE Phase 1 negotiation has not progressed past the initial state. This typically means that the remote peer is not responding or the ISAKMP policy does not match.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The IPsec VPN tunnel is fully established and passing traffic.
Why it's wrong here
MM_NO_STATE means no IKE SA has been established; the tunnel is not up.
✓
IKE Phase 1 is in progress but not yet complete.
Why this is correct
MM_NO_STATE is the initial state before Main Mode completes; it indicates negotiation is ongoing or stuck.
Related concept
Read the scenario before looking for a memorised answer.
✗
The ISAKMP SA has been deleted due to a timeout.
Why it's wrong here
A deleted SA would not appear in the output; this shows an active attempt.
✗
The remote peer has rejected the IKE proposal.
Why it's wrong here
Rejection would typically show a different state like MM_NO_STATE with a failure reason, but this output does not indicate rejection.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
A deleted SA would not appear in the output; this shows an active attempt.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 350-401 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which 350-401 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
VPN Technologies — This question tests VPN Technologies — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: IKE Phase 1 is in progress but not yet complete. — The MM_NO_STATE indicates that the IKE Phase 1 negotiation has not progressed past the initial state. This typically means that the remote peer is not responding or the ISAKMP policy does not match.
What should I do if I get this 350-401 question wrong?
Identify which 350-401 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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