hardMultiple ChoiceObjective-mapped
300-410 Practice Question: An engineer configures IPsec site-to-site VPN…
An engineer configures IPsec site-to-site VPN with a route map that defines interesting traffic using an extended access list. The VPN tunnel is established, but traffic from the local LAN to the remote LAN is not encrypted. The engineer verifies that the access list matches the traffic correctly. Which is the most likely explanation?
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 route map must be applied to the crypto map using the 'match ip address' command, but route maps are not supported for crypto maps.
In IPsec, the crypto map applies to the interface, and the access list defines interesting traffic. However, if the route map is applied to the crypto map, it is not used for interesting traffic; route maps are not supported for defining interesting traffic in crypto maps. The correct method is to use an access list directly in the crypto map. The edge case is that the engineer mistakenly used a route map instead of an access list.
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 route map must be applied to the crypto map using the 'match ip address' command, but route maps are not supported for crypto maps.
Why this is correct
Crypto maps only support access lists for interesting traffic; route maps are not valid.
- ✗
The crypto map is applied to the wrong interface; it should be applied to the LAN interface.
Why it's wrong here
Crypto maps are applied to the outgoing interface (tunnel or WAN).
- ✗
The IPsec transform set is missing the ESP protocol.
Why it's wrong here
Transform set mismatch would prevent tunnel establishment, not encryption.
- ✗
The route map uses a prefix-list instead of an access list.
Why it's wrong here
Prefix-lists are also not supported; only access lists.
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.