ANS-C01 Customer Gateway (CGW) Practice Question
A company has a VPC with a CIDR block of 10.0.0.0/16 and needs to establish connectivity to an on-premises network via AWS Site-to-Site VPN. The on-premises network uses a CIDR block of 192.168.0.0/16. The VPN connection will be redundant using two tunnels. Which THREE actions are required to enable this connectivity?
⚠ Common exam trap
Candidates often omit the route addition and think only the CGW and VGW are needed, but full connectivity also requires a route in the VPC route table pointing to the VGW for the on-premises CIDR.
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
✓
Create a Customer Gateway (CGW) in the same AWS region.
To establish an AWS Site-to-Site VPN, three actions are required: creating a Customer Gateway (CGW), creating a Virtual Private Gateway (VGW) and attaching it to the VPC, and adding a route in the VPC route tables pointing to the VGW for the on-premises CIDR. The correct answers are A, C, and E.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create a Customer Gateway (CGW) in the same AWS region.
Why this is correct
Correct. The CGW must be created to represent the on-premises device.
- ✗
Create a Direct Connect virtual interface.
Why it's wrong here
Incorrect. Direct Connect is a different service, not required for Site-to-Site VPN.
- ✓
Create a Virtual Private Gateway (VGW) and attach it to the VPC.
Why this is correct
Correct. A VGW must be created and attached to the VPC to terminate the VPN tunnels.
- ✗
Configure a NAT Gateway in the VPC.
Why it's wrong here
Incorrect. A NAT Gateway is used for outbound internet traffic, not for VPN connectivity.
- ✓
Add a route in the VPC route tables pointing to the VGW for the on-premises CIDR.
Why this is correct
Incorrect. While a route is eventually needed, it is not one of the two primary actions required to enable the VPN; it is a subsequent configuration step.
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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.