This ANS-C01 practice question tests your understanding of network implementation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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.
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.)
A customer gateway resource representing the on-premises VPN device.
Defines the on-premises endpoint.
A public virtual interface.
Why wrong: Used for Direct Connect, not VPN.
A virtual private gateway or transit gateway attached to the VPC.
Terminates the VPN on AWS side.
An AWS Direct Connect connection.
Why wrong: Not required for VPN.
Two VPN tunnels for high availability.
AWS VPN always creates two tunnels.
Answer choices
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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.
Related concept
Read the scenario before looking for a memorised answer.
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.
Related concept
Read the scenario before looking for a memorised answer.
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.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often 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.
Detailed technical explanation
A site-to-site VPN uses IPsec tunnels (IKEv1 or IKEv2) to encrypt traffic between the on-premises network and the VPC, with each tunnel providing a separate security association for redundancy. The virtual private gateway or transit gateway acts as the AWS-side VPN concentrator, terminating the tunnels and routing traffic to the VPC subnets, while the customer gateway resource stores the on-premises device's public IP and routing options (static or BGP).
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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FAQ
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
The correct answer is: 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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.
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