mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show crypto ipsec sa | include pkts
#pkts encaps: 0, #pkts encrypt: 0, #pkts digest: 0 #pkts decaps: 0, #pkts decrypt: 0, #pkts verify: 0 #pkts encaps: 0, #pkts encrypt: 0, #pkts digest: 0 #pkts decaps: 0, #pkts decrypt: 0, #pkts verify: 0
Based on this output, what is the problem?
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
✓
No interesting traffic is being sent through the tunnel; check the crypto ACL and routing.
All packet counters are zero, indicating no traffic has been encrypted or decrypted. This could be due to a misconfigured crypto ACL that does not match the actual traffic, or routing issues preventing traffic from reaching the 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.
- ✗
The IPsec SA is not established; the tunnel is down.
Why it's wrong here
The SA may be established but no traffic is flowing; the output does not show SA state.
- ✓
No interesting traffic is being sent through the tunnel; check the crypto ACL and routing.
Why this is correct
Zero packet counts indicate no traffic matches the crypto ACL or routing is not directing traffic to the tunnel.
- ✗
The tunnel is working correctly; all packets are being encrypted.
Why it's wrong here
Zero packets means nothing is being encrypted.
- ✗
The remote peer is not responding; the SA is in MM_NO_STATE.
Why it's wrong here
The SA might be up; zero packets do not indicate peer unresponsiveness.
Visual reference
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.