- A
A security group must be associated with the Client VPN endpoint.
Why wrong: Security groups are optional; you can use network ACLs instead.
- B
The Client VPN endpoint must be in a subnet with a route to the internet.
Clients need to reach the endpoint via internet.
- C
The client CIDR range must be within the VPC CIDR.
Why wrong: It must not overlap with the VPC CIDR.
- D
The client CIDR range must not overlap with the VPC CIDR or on-premises networks.
Overlap would cause routing conflicts.
- E
The Client VPN endpoint must use certificate-based server authentication only.
Why wrong: Client VPN supports mutual authentication; client certificates are also required.
Question 206 of 1,705
AWS Client VPN Configuration Requirements
This ANS-C01 practice question tests your understanding of network management and operations. 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. 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 TWO are requirements for using AWS Client VPN to provide secure remote access?
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
✓
The Client VPN endpoint must be in a subnet with a route to the internet.
Option B is correct because the Client VPN endpoint must be deployed in a subnet that has a route to the internet. This is necessary for the endpoint to establish the initial TLS handshake with client devices and to route traffic between the client and the VPC. Option D is correct because the client CIDR range must not overlap with the VPC CIDR or on-premises networks to avoid routing conflicts. Options A, C, and E are incorrect: security groups are not required for Client VPN endpoints; the client CIDR does not need to be within the VPC CIDR; and certificate-based server authentication is not the only method—mutual authentication is also supported.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 security group must be associated with the Client VPN endpoint.
Why it's wrong here
Security groups are optional; you can use network ACLs instead.
- ✓
The Client VPN endpoint must be in a subnet with a route to the internet.
Why this is correct
Clients need to reach the endpoint via internet.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The client CIDR range must be within the VPC CIDR.
Why it's wrong here
It must not overlap with the VPC CIDR.
- ✓
The client CIDR range must not overlap with the VPC CIDR or on-premises networks.
Why this is correct
Overlap would cause routing conflicts.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The Client VPN endpoint must use certificate-based server authentication only.
Why it's wrong here
Client VPN supports mutual authentication; client certificates are also required.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a security group is mandatory for all AWS resources, but Client VPN endpoints use authorization rules instead, and they may also incorrectly think the client CIDR must be a subset of the VPC CIDR, when in fact it must be non-overlapping.
Detailed technical explanation
How to think about this question
The client CIDR range is used to assign IP addresses to connected clients from a pool that must not overlap with the VPC CIDR or any on-premises networks to prevent routing conflicts. The Client VPN endpoint uses a network interface in the specified subnet, and the subnet must have an internet gateway route for the endpoint to be reachable from clients. Under the hood, the endpoint establishes a TLS VPN tunnel using the OpenVPN protocol, and the client CIDR range is advertised to the VPC route table to enable traffic forwarding.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Management and Operations — This question tests Network Management and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Client VPN endpoint must be in a subnet with a route to the internet. — Option B is correct because the Client VPN endpoint must be deployed in a subnet that has a route to the internet. This is necessary for the endpoint to establish the initial TLS handshake with client devices and to route traffic between the client and the VPC. Option D is correct because the client CIDR range must not overlap with the VPC CIDR or on-premises networks to avoid routing conflicts. Options A, C, and E are incorrect: security groups are not required for Client VPN endpoints; the client CIDR does not need to be within the VPC CIDR; and certificate-based server authentication is not the only method—mutual authentication is also supported.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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