SDSI Secure Infrastructure Design Practice Question
When designing a remote access VPN solution using Cisco AnyConnect, which protocol is preferred to optimize performance for latency-sensitive applications like VoIP?
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
✓
DTLS
DTLS (Datagram Transport Layer Security) is preferred for performance as it uses UDP, reducing the overhead and latency associated with TCP-based TLS.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
DTLS
Why this is correct
DTLS provides a low-latency connection suitable for real-time traffic.
- ✗
TLS
Why it's wrong here
TLS uses TCP, which is prone to latency issues due to head-of-line blocking.
- ✗
IPsec IKEv2
Why it's wrong here
While IPsec is fast, AnyConnect specifically uses DTLS/TLS as its primary transport.
- ✗
SSTP
Why it's wrong here
SSTP is a Microsoft-specific protocol, not native to AnyConnect.
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
This SDSI question is part of Courseiva's 298-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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.