The answer is to create subnet associations and authorization rules. A Client VPN endpoint must be associated with each subnet you want clients to reach, which places the endpoint’s elastic network interface into that subnet and enables traffic flow. Then, authorization rules are required to explicitly grant access to the target network CIDR, defining which client groups can reach which subnets. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this tests your understanding that subnet associations handle connectivity, while authorization rules enforce access control—a common trap is confusing security groups (which filter traffic at the endpoint itself) with subnet-level permissions. Remember, the VPN endpoint is the gateway, not the subnet’s firewall. Memory tip: “Associate to connect, authorize to allow”—you must do both for client VPN access to multiple subnets.
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 deploying an AWS Client VPN endpoint to provide remote access to its VPC resources. The company wants to allow clients to access resources in multiple subnets within the VPC. Which TWO configurations are necessary?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Associate the Client VPN endpoint with subnets in the VPC.
Option A is correct because the Client VPN endpoint must be associated with the VPC's subnets via a subnet association. Option C is correct because authorization rules specify which groups can access which networks. Option B is wrong because security groups are applied to the Client VPN endpoint, not to the target subnets directly. Option D is wrong because route tables are automatically propagated, but the question asks for necessary configurations. Option E is wrong because a transit gateway is not required for a single VPC.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Configure route tables in the VPC to direct traffic to the Client VPN endpoint.
Why it's wrong here
Routes are automatically added when the endpoint is associated with subnets.
✓
Associate the Client VPN endpoint with subnets in the VPC.
Why this is correct
Subnet associations allow the endpoint to have elastic network interfaces in those subnets.
Related concept
Authentication checks who the user is.
✓
Create authorization rules to allow access to the target networks.
Why this is correct
Authorization rules define which users can access which networks.
Security groups are applied to the VPN endpoint, not subnets.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related ANS-C01 questions on access control and AAA configuration.
Network Implementation — This question tests Network Implementation — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Associate the Client VPN endpoint with subnets in the VPC. — Option A is correct because the Client VPN endpoint must be associated with the VPC's subnets via a subnet association. Option C is correct because authorization rules specify which groups can access which networks. Option B is wrong because security groups are applied to the Client VPN endpoint, not to the target subnets directly. Option D is wrong because route tables are automatically propagated, but the question asks for necessary configurations. Option E is wrong because a transit gateway is not required for a single VPC.
What should I do if I get this ANS-C01 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related ANS-C01 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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