- A
Create a Customer Gateway (CGW) in the same AWS region.
Correct. The CGW must be created to represent the on-premises device.
- B
Create a Direct Connect virtual interface.
Why wrong: Incorrect. Direct Connect is a different service, not required for Site-to-Site VPN.
- C
Create a Virtual Private Gateway (VGW) and attach it to the VPC.
Correct. A VGW must be created and attached to the VPC to terminate the VPN tunnels.
- D
Configure a NAT Gateway in the VPC.
Why wrong: Incorrect. A NAT Gateway is used for outbound internet traffic, not for VPN connectivity.
- E
Add a route in the VPC route tables pointing to the VGW for the on-premises CIDR.
Why wrong: 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.
ANS-C01 Customer Gateway (CGW) Practice Question
This ANS-C01 practice question tests your understanding of network implementation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. A key principle to apply: customer Gateway (CGW). Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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 TWO actions are required to enable this connectivity?
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. Although the question asks for two, all three are necessary for full connectivity. The correct answers are A, C, and E.
Key principle: Customer Gateway (CGW)
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.
Related concept
Customer Gateway (CGW)
- ✗
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.
- ✗
Configure a NAT Gateway in the VPC.
- ✗
Add a route in the VPC route tables pointing to the VGW for the on-premises CIDR.
Why it's wrong here
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is that candidates often think the route addition is a required action, but the question specifically asks for the two actions needed to enable connectivity, which are creating the CGW and VGW.
Detailed technical explanation
How to think about this question
The Site-to-Site VPN uses two IPsec tunnels for redundancy, each established between the CGW (on-premises device) and the VGW (AWS endpoint). The VGW propagates routes to the VPC route tables, and a static route (or BGP) must be added for the on-premises CIDR (192.168.0.0/16) pointing to the VGW to direct traffic through the tunnels. Under the hood, the VGW uses BGP (if dynamic routing is configured) or static routing to exchange routes with the CGW.
KKey Concepts to Remember
- Customer Gateway (CGW)
- Virtual Private Gateway (VGW)
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Customer Gateway (CGW)
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review customer Gateway (CGW), then practise related ANS-C01 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Customer Gateway (CGW).
What is the correct answer to this question?
The correct answer is: 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. Although the question asks for two, all three are necessary for full connectivity. The correct answers are A, C, and E.
What should I do if I get this ANS-C01 question wrong?
Review customer Gateway (CGW), then practise related ANS-C01 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Customer Gateway (CGW)
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Last reviewed: Jul 4, 2026
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