ANS-C01 AWS Site-to-Site VPN Practice Question
A company wants to securely connect an on-premises data center to an AWS VPC over the internet using IPsec. Which AWS service should be used?
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
✓
AWS Site-to-Site VPN
WS Site-to-Site VPN, which creates IPsec tunnels over the internet to securely connect an on-premises data center to an AWS VPC. Option A (AWS Transit Gateway) is a network transit hub that can interconnect multiple VPCs and VPNs, but it is not the VPN service itself. Option B (AWS Direct Connect) provides a dedicated physical connection, not over the internet. Option C (AWS Client VPN) is for individual remote users, not for site-to-site connections.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
AWS Transit Gateway
Why it's wrong here
Transit Gateway interconnects VPCs and on-premises but requires a VPN attachment.
- ✗
AWS Direct Connect
Why it's wrong here
Direct Connect is a physical connection, not over the internet.
- ✗
AWS Client VPN
Why it's wrong here
Client VPN is for remote users connecting to AWS.
- ✓
AWS Site-to-Site VPN
Why this is correct
It creates IPsec tunnels over the internet.
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 ANS-C01 practice question is part of Courseiva's free Amazon Web Services 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 ANS-C01 exam.