ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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.
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.
✗
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.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
When a Client VPN endpoint is associated with a subnet, AWS creates an elastic network interface (ENI) in that subnet. The subnet's route table must contain a route with destination the client CIDR (e.g., 10.200.0.0/16) and target the VPN endpoint's ENI. This route is not automatically added; it must be explicitly configured. Without it, the subnet cannot route return traffic from VPC resources back to the VPN clients, causing a one-way connectivity failure where clients can connect but cannot reach resources.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 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.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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