ANS-C01 Network Management and Operations Practice Question
A company is using AWS Client VPN to provide remote access to its VPC. Users report that they can connect to the VPN but cannot reach resources in the VPC. The Client VPN endpoint is associated with a single subnet in the VPC, and the authorization rules allow access to the entire VPC CIDR (10.0.0.0/16). The security group assigned to the Client VPN endpoint allows all traffic. What is the most likely cause of this issue?
⚠ Common exam trap
AWS often tests the misconception that security groups or authorization rules are the primary cause of connectivity issues after a successful VPN connection, when in reality the missing route in the subnet's route table is the most common culprit for one-way traffic failures in AWS Client VPN.
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 route table associated with the Client VPN subnet does not have a route for the client IP range.
The Client VPN endpoint is associated with a single subnet in the VPC. For traffic from the VPN clients to reach resources in the VPC, the route table of that subnet must include a route pointing the client IP range back to the VPN endpoint's network interface. Without this route, the subnet has no path to forward return traffic to the clients, even though the clients can establish the VPN tunnel. Option B correctly identifies this missing route as the root cause.
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 security group assigned to the Client VPN endpoint does not allow inbound traffic from the client CIDR.
Why it's wrong here
The security group allows all traffic, so this is not the issue.
- ✓
The route table associated with the Client VPN subnet does not have a route for the client IP range.
Why this is correct
Without a return route, traffic from instances cannot reach the VPN clients.
- ✗
The authorization rule is too broad and is blocking traffic.
Why it's wrong here
A broad rule allows traffic; it does not block it.
- ✗
The Client VPN endpoint does not have a security group association group configured.
Why it's wrong here
Association groups are optional and not required for basic connectivity.
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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.