- A
The EEM applet clears all crypto SAs whenever a DMVPN tunnel comes up, disrupting existing SAs.
Clearing all crypto SAs forces renegotiation, causing spoke-to-spoke failures.
- B
The DMVPN tunnel is misconfigured with mismatched IPsec profiles.
Why wrong: No evidence of misconfiguration; the issue is the EEM clear command.
- C
The spoke router has an incorrect NHRP mapping.
Why wrong: The tunnel is up, so NHRP is working; the problem is the crypto SA clearing.
- D
The hub router has a routing protocol issue preventing spoke-to-spoke routes.
Why wrong: Routing is not mentioned; the issue is the EEM applet.
Question 1,658 of 2,152
EEM DMVPN Tunnel Failures
This 300-410 practice question tests your understanding of embedded event manager (eem). Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 DMVPN network is experiencing spoke-to-spoke tunnel failures. R1 (hub) has: event manager applet DMVPN-TRIGGER event syslog pattern "%DMVPN-5-UP" action 1.0 cli command "enable" action 2.0 cli command "clear crypto sa" action 3.0 syslog msg "Cleared crypto SAs". Router R2 (spoke) shows: DMVPN tunnel is up, but IPsec SAs are renegotiating frequently. What is the root cause?
Quick Answer
The root cause is the EEM applet clearing all crypto SAs whenever a DMVPN tunnel comes up, which disrupts existing spoke-to-spoke IPsec security associations. This happens because the applet triggers on the syslog pattern "%DMVPN-5-UP" and executes "clear crypto sa" without filtering, forcing all tunnels to renegotiate their SAs simultaneously. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of how EEM applets interact with DMVPN tunnel failures and the importance of granular SA management—a common trap is assuming any "clear crypto" command is harmless during troubleshooting. The key insight is that the hub’s applet does not differentiate between new and existing tunnels, causing frequent renegotiation on the spoke. For the exam, remember: when you see an EEM applet tied to a DMVPN syslog event with a blanket "clear crypto sa," think "one size fits all—and fails all." Memory tip: "UP clears all, then all fall down."
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
✓
The EEM applet clears all crypto SAs whenever a DMVPN tunnel comes up, disrupting existing SAs.
The EEM applet triggers on any DMVPN tunnel UP event and clears all crypto security associations (SAs). This forces renegotiation of IPsec SAs for all tunnels, causing temporary loss of spoke-to-spoke connectivity. The correct fix is to clear only specific SAs or avoid clearing them on DMVPN UP events.
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 EEM applet clears all crypto SAs whenever a DMVPN tunnel comes up, disrupting existing SAs.
Why this is correct
Clearing all crypto SAs forces renegotiation, causing spoke-to-spoke failures.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The DMVPN tunnel is misconfigured with mismatched IPsec profiles.
Why it's wrong here
No evidence of misconfiguration; the issue is the EEM clear command.
- ✗
The spoke router has an incorrect NHRP mapping.
Why it's wrong here
The tunnel is up, so NHRP is working; the problem is the crypto SA clearing.
- ✗
The hub router has a routing protocol issue preventing spoke-to-spoke routes.
Why it's wrong here
Routing is not mentioned; the issue is the EEM applet.
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
No evidence of misconfiguration; the issue is the EEM clear command.
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.
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Embedded Event Manager (EEM) — This question tests Embedded Event Manager (EEM) — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The EEM applet clears all crypto SAs whenever a DMVPN tunnel comes up, disrupting existing SAs. — The EEM applet triggers on any DMVPN tunnel UP event and clears all crypto security associations (SAs). This forces renegotiation of IPsec SAs for all tunnels, causing temporary loss of spoke-to-spoke connectivity. The correct fix is to clear only specific SAs or avoid clearing them on DMVPN UP events.
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
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Last reviewed: Jun 18, 2026
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