mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to verify crypto…
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
What does this output indicate?
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
✓
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.
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.
- ✗
The IPsec SA is failing due to algorithm mismatch.
Why it's wrong here
Incorrect because there is no indication of failure.
- ✗
The connection is for IKE, not IPsec.
Why it's wrong here
Incorrect because the type is 'IPsec'.
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.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.