ANS-C01 Network Implementation Practice Question
A company has a VPC with a CIDR of 10.0.0.0/16. They have two Availability Zones, each with a public and a private subnet. They want to connect their on-premises network (192.168.0.0/16) to the VPC using a site-to-site VPN. Which THREE resources are needed to establish the VPN connection? (Choose THREE.)
⚠ Common exam trap
It's easy for candidates to confuse AWS Transit Gateway as a mandatory component for VPNs, but it is only needed when connecting multiple VPCs or VPNs centrally, not for a single VPC-to-on-premises VPN.
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
✓
Customer Gateway
A Customer Gateway (option A) is required because it represents the on-premises VPN device in AWS, providing the public IP address and routing information needed to establish the IPsec tunnel. A VPN Connection (option C) is the logical resource that ties together the Customer Gateway and the Virtual Private Gateway, defining the tunnel settings, pre-shared keys, and routing options. A Virtual Private Gateway (option E) is the AWS-side endpoint attached to the VPC that terminates the VPN tunnels and routes traffic between the VPC and the on-premises 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.
- ✓
Customer Gateway
Why this is correct
Required to represent the on-premises router.
- ✗
AWS Direct Connect
Why it's wrong here
Separate dedicated connection, not VPN.
- ✓
VPN Connection
Why this is correct
The actual VPN tunnel between VPG and CGW.
- ✗
AWS Transit Gateway
Why it's wrong here
Not required for a basic site-to-site VPN.
- ✓
Virtual Private Gateway
Why this is correct
Required on the VPC side.
Visual reference
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.