The answer is that an IPsec SA is active with 100 packets encrypted and decrypted, confirming traffic is flowing over the DMVPN tunnel. This output from the show crypto engine connections active command directly reveals the cryptographic workload on the router, where the Encrypt and Decrypt counters increment equally when bidirectional traffic passes through the IPsec tunnel. In the context of the Cisco CCNP ENARSI 300-410 exam, this command is used to verify that a DMVPN spoke has successfully established phase 2 security associations and that data is being protected; a common trap is mistaking a zero in the Encrypt or Decrypt column for a failed tunnel, when it may simply indicate no user traffic has yet traversed it. The key insight is that matching non-zero Encrypt and Decrypt values prove the tunnel is actively carrying packets, not just that the control plane is up. For a quick memory tip, think “Encrypt equals Decrypt equals traffic is flowing” to avoid confusing this with the show crypto isakmp sa output, which only verifies the control channel.
300-410 DMVPN Practice Question
This 300-410 practice question tests your understanding of dmvpn. 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 to verify crypto engine connections on a DMVPN spoke:
R2# show crypto engine connections active
Crypto Engine Connections
ID Type Algorithm Encrypt Decrypt LastSeqN IP-Address
1 IPsec AES256-SHA 100 100 100 192.168.1.2
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
An IPsec SA is active with 100 packets encrypted and decrypted, indicating traffic flow.
The output shows one active IPsec connection using AES256-SHA, with 100 packets encrypted and decrypted, indicating traffic is flowing over the DMVPN tunnel.
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.
✗
No IPsec SAs are active; the connection list is empty.
Why it's wrong here
Incorrect because there is one active connection.
✓
An IPsec SA is active with 100 packets encrypted and decrypted, indicating traffic flow.
Why this is correct
Correct: The output shows an active IPsec SA with counters increasing.
Related concept
Read the scenario before looking for a memorised answer.
✗
The IPsec SA is failing due to algorithm mismatch.
Why it's wrong here
Incorrect because there is no indication of failure.
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.
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: An IPsec SA is active with 100 packets encrypted and decrypted, indicating traffic flow. — The output shows one active IPsec connection using AES256-SHA, with 100 packets encrypted and decrypted, indicating traffic is flowing over the DMVPN tunnel.
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.
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Question Discussion
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