ANS-C01 Network Management and Operations Practice Question
A company is using AWS Client VPN to provide remote access to their VPC. Users report that they can connect to the VPN but cannot reach any resources in the VPC. What is the most likely cause?
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 does not have a subnet association.
If users can connect to the VPN but cannot reach resources in the VPC, the most likely cause is that the Client VPN endpoint lacks a subnet association. Without a subnet association, the endpoint cannot route traffic to the VPC. Option A is incorrect because authorization rules control which users can access specific resources, but the issue is broader connectivity. Option C is incorrect because the security group controls inbound traffic to the endpoint, but the connection itself works; the problem is routing. Option D is incorrect because DNS configuration affects name resolution, not basic IP reachability.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The authorization rules do not include the client's group.
Why it's wrong here
Authorization rules determine which users or groups can access specific resources, but the issue here is that no traffic can reach the VPC at all, which points to a routing problem rather than authorization.
- ✓
The Client VPN endpoint does not have a subnet association.
Why this is correct
Correct. Without a subnet association, the Client VPN endpoint cannot route traffic to the VPC, causing the inability to reach any resources even though the VPN connection is established.
- ✗
The Client VPN endpoint security group does not allow inbound traffic from the client CIDR.
Why it's wrong here
The security group for the Client VPN endpoint controls inbound traffic to the endpoint itself. However, users are already connecting successfully; the problem is that traffic is not being forwarded to the VPC, which is a routing issue, not a security group issue.
- ✗
The client's VPN software is not configured with the correct DNS server.
Why it's wrong here
DNS server configuration affects name resolution, but the issue is that users cannot reach resources by IP either, indicating a routing problem rather than DNS.
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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.