SDSI Secure Infrastructure Design Practice Question
When designing a site-to-site VPN, which IKEv2 feature allows the tunnel to be established without requiring a static IP address on one side?
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
✓
IKEv2 ID-based authentication
IKEv2 allows for identity-based authentication using certificates or pre-shared keys that do not depend on the peer's IP address.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
IKEv2 Virtual Tunnel Interfaces
Why it's wrong here
VTI is a configuration method, not an address-agnostic feature.
- ✗
AnyConnect Mobility
Why it's wrong here
AnyConnect is for remote access, not site-to-site.
- ✓
IKEv2 ID-based authentication
Why this is correct
Using IDs (like FQDNs) allows tunnels to form when IPs are dynamic.
- ✗
Dead Peer Detection
Why it's wrong here
DPD is for tunnel maintenance, not tunnel establishment.
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.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Cisco exam blueprint
This SDSI 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 SDSI exam.