ANS-C01 Network Implementation Practice Question
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.)
⚠ Common exam trap
Test-takers frequently confuse the requirements for a site-to-site VPN with those for AWS Direct Connect, mistakenly selecting a public virtual interface or Direct Connect connection as necessary components when they are actually part of a separate hybrid connectivity solution.
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
✓
A customer gateway resource representing the on-premises VPN device.
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.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A customer gateway resource representing the on-premises VPN device.
Why this is correct
Defines the on-premises endpoint.
- ✗
A public virtual interface.
Why it's wrong here
Used for Direct Connect, not VPN.
- ✓
A virtual private gateway or transit gateway attached to the VPC.
Why this is correct
Terminates the VPN on AWS side.
- ✗
An AWS Direct Connect connection.
Why it's wrong here
Not required for VPN.
- ✓
Two VPN tunnels for high availability.
Why this is correct
AWS VPN always creates two tunnels.
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.