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 uses AWS Client VPN to provide remote access to its VPC resources. Users report that they can connect to the VPN but cannot reach any resources in the VPC. The VPN endpoint is associated with a subnet in VPC A. The VPC's route table has a route for the Client VPN CIDR (10.200.0.0/16) pointing to the VPN endpoint. The security group assigned to the VPN endpoint allows inbound traffic from the VPN clients. What is the most likely cause of the 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 security group associated with the VPN endpoint does not allow inbound traffic from the VPN client CIDR.
The most likely cause is that the security group associated with the VPN endpoint does not allow inbound traffic from the VPN client CIDR (10.200.0.0/16). Even though users can connect to the VPN, the security group acts as a virtual firewall for the endpoint; without an inbound rule permitting traffic from the client CIDR, packets from clients are dropped before they can be routed to VPC resources. The question states that the security group allows inbound traffic from 'the VPN clients' but not specifically from the client CIDR range, which is a common misconfiguration.
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 Client VPN endpoint's authentication is failing.
Why it's wrong here
Users can connect, so authentication is successful.
✗
The VPN endpoint is not associated with the correct subnet.
Why it's wrong here
The question states it is associated with a subnet in VPC A, so this is likely not the issue.
✗
The route table in VPC A does not have a route for the Client VPN CIDR.
Why it's wrong here
The question states the route exists.
✓
The security group associated with the VPN endpoint does not allow inbound traffic from the VPN client CIDR.
Why this is correct
The security group must allow inbound traffic from the client CIDR (10.200.0.0/16) to reach VPC resources.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume a successful VPN connection implies all traffic is allowed, but AWS security groups operate independently of the VPN tunnel and must explicitly permit traffic from the client CIDR range.
Detailed technical explanation
How to think about this question
AWS Client VPN endpoints use security groups to filter traffic at the network interface level, similar to how security groups work for EC2 instances. Even after successful authentication and tunnel establishment, all traffic from the client CIDR must be allowed by the security group's inbound rules; if the rule is missing or too restrictive, packets are silently dropped. In practice, this often occurs when administrators create a security group rule allowing traffic from '0.0.0.0/0' or from a specific client IP but forget to include the full client CIDR range, especially when using split-tunneling or dynamic client IP assignment.
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 security group associated with the VPN endpoint does not allow inbound traffic from the VPN client CIDR. — The most likely cause is that the security group associated with the VPN endpoint does not allow inbound traffic from the VPN client CIDR (10.200.0.0/16). Even though users can connect to the VPN, the security group acts as a virtual firewall for the endpoint; without an inbound rule permitting traffic from the client CIDR, packets from clients are dropped before they can be routed to VPC resources. The question states that the security group allows inbound traffic from 'the VPN clients' but not specifically from the client CIDR range, which is a common misconfiguration.
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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