ANS-C01 Network Implementation Practice Question
Which THREE components are required to establish a site-to-site VPN connection between an on-premises network and AWS? (Choose THREE.)
⚠ Common exam trap
Many exam-takers confuse optional components like Transit Gateway or Direct Connect as mandatory for a site-to-site VPN, when in fact only the VGW, CGW, and VPN Connection are strictly required.
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
✓
Virtual Private Gateway
A Virtual Private Gateway (VGW) is required as the AWS-side VPN concentrator for a site-to-site VPN connection. It attaches to a VPC and terminates the IPsec tunnels from the on-premises network, enabling encrypted traffic between the VPC and the remote network.
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 Direct Connect
Why it's wrong here
Not required for VPN.
- ✗
AWS Transit Gateway
Why it's wrong here
Optional, not required.
- ✓
Virtual Private Gateway
Why this is correct
AWS side VPN endpoint.
- ✓
Customer Gateway
Why this is correct
Represents the on-premises VPN device.
- ✓
VPN Connection
Why this is correct
The actual VPN tunnel configuration.
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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Variation 1. Which THREE of the following are required to configure a site-to-site VPN connection between an on-premises network and an Amazon VPC? (Select THREE.)
hard- ✓ A.A customer gateway resource representing the on-premises VPN device.
- B.A public virtual interface.
- ✓ C.A virtual private gateway or transit gateway attached to the VPC.
- D.An AWS Direct Connect connection.
- ✓ E.Two VPN tunnels for high availability.
Why A: A customer gateway resource is required because it represents the on-premises VPN device in AWS, providing the necessary configuration information such as the device's public IP address and BGP ASN (if dynamic routing is used) to establish the site-to-site VPN connection. Without this resource, AWS has no reference to the remote endpoint for the IPsec tunnels.
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.