CND Practice Question: Enterprise Cloud Virtual And Wireless Network Protection
An enterprise administrator is setting up an AWS Site-to-Site VPN connection between an on-premises data center and an AWS VPC. To ensure maximum data confidentiality and integrity across the public internet, which IPsec cryptographic parameters should be enforced in the VPN tunnel configuration?
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
✓
AES-256 encryption, SHA-2 (SHA-384) integrity, and DH Group 14 or higher
AWS Site-to-Site VPN supports custom IPsec tunnel configuration options, allowing administrators to enforce AES-256 encryption, SHA-2 hashing, and strong Diffie-Hellman groups.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RC4 encryption, SHA-1 integrity, and no PFS
Why it's wrong here
RC4 and SHA-1 are deprecated and vulnerable to collision and recovery attacks.
- ✗
AES-128 encryption, MD5 integrity, and DH Group 2
Why it's wrong here
MD5 is deprecated and insecure for modern enterprise VPN tunnels.
- ✓
AES-256 encryption, SHA-2 (SHA-384) integrity, and DH Group 14 or higher
Why this is correct
AES-256, SHA-384, and high Diffie-Hellman groups provide robust cryptographic strength meeting enterprise compliance standards.
- ✗
DES encryption, MD5 integrity, and DH Group 1
Why it's wrong here
DES and MD5 are cryptographically broken and insecure.
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 CND question is part of Courseiva's 323-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 EC-Council exam blueprint
This CND practice question is part of Courseiva's free EC-Council 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 CND exam.