The answer is that IKE negotiation succeeded and an IPsec SA is now active. This is correct because the debug output shows the complete two-phase process of IKE Phase 1 negotiation: Main Mode completes after exchanging SA proposals, followed by Quick Mode where the actual IPsec security association is established. The sequence of “MM_SA proposal,” “MM_SA response,” then “Main Mode complete” confirms successful Phase 1 authentication and keying, while the subsequent “QM_SA request” and “QM_SA response” confirm Phase 2. On the Cisco CCNP ENARSI 300-410 exam, this type of debug output tests your ability to distinguish between a successful IKE negotiation and common failures like mismatched pre-shared keys or proposal mismatches—a frequent trap is mistaking a partial exchange (e.g., only MM_SA sent) for success. Remember the mnemonic “Main Mode first, Quick Mode last” to verify that both phases must complete for a working IPsec tunnel.
300-410 DMVPN Practice Question
This 300-410 practice question tests your understanding of dmvpn. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 to troubleshoot IPsec on a DMVPN tunnel:
R1# debug crypto isakmp
ISAKMP: received peer 192.168.1.2, port 500, local 192.168.1.1
ISAKMP: SA created, initiating IKE Main Mode
ISAKMP: sent MM_SA proposal to 192.168.1.2
ISAKMP: received MM_SA response from 192.168.1.2
ISAKMP: Main Mode complete, starting Quick Mode
ISAKMP: sent QM_SA request to 192.168.1.2
ISAKMP: received QM_SA response from 192.168.1.2
ISAKMP: Quick Mode done, IPsec SA established
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
IKE negotiation succeeded and an IPsec SA is now active.
The debug shows successful IKE Main Mode and Quick Mode exchanges, resulting in an established IPsec SA between 192.168.1.1 and 192.168.1.2.
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.
✗
IKE negotiation failed; no IPsec SA was established.
Why it's wrong here
Incorrect because the output shows both Main Mode and Quick Mode completed successfully.
✓
IKE negotiation succeeded and an IPsec SA is now active.
Why this is correct
Correct: The debug confirms Main Mode and Quick Mode completion, and states 'IPsec SA established'.
Related concept
Read the scenario before looking for a memorised answer.
✗
The peer 192.168.1.2 is not responding to IKE requests.
Why it's wrong here
Incorrect because responses are received.
✗
IKE is using Aggressive Mode instead of Main Mode.
Why it's wrong here
Incorrect because the output explicitly mentions Main Mode.
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
Incorrect because the output shows both Main Mode and Quick Mode completed successfully.
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 300-410 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Identify which 300-410 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.
DMVPN — This question tests DMVPN — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: IKE negotiation succeeded and an IPsec SA is now active. — The debug shows successful IKE Main Mode and Quick Mode exchanges, resulting in an established IPsec SA between 192.168.1.1 and 192.168.1.2.
What should I do if I get this 300-410 question wrong?
Identify which 300-410 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. 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?
medium
✓ A.IKE phase 1 is complete for both peers.
B.IKE phase 2 is complete for both peers.
C.The IPsec tunnels are established.
D.The peers are not responding.
Why A: 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).
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Question Discussion
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