Question 883 of 1,621
ANS-C01 Network Implementation Practice Question
A company is implementing an AWS Client VPN endpoint to provide remote access to its VPC resources. The company's on-premises network uses a split-tunneling configuration to route only corporate traffic through the VPN. The Client VPN endpoint is associated with a single subnet in the VPC. Users report that they can connect to the Client VPN but cannot reach resources in the VPC. The Client VPN endpoint's security group allows all traffic. What is the MOST likely cause of this issue?
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 of the subnet where the Client VPN endpoint is attached does not have a route to the VPC CIDR.
The Client VPN endpoint is attached to a subnet. For clients to reach resources in the VPC, the subnet's route table must have a route to the VPC CIDR. Without this route, traffic from the VPN clients cannot reach the VPC resources, even though the VPN connection is established. Option A is incorrect because the security group for the Client VPN endpoint already allows all traffic, so inbound rules are not the issue. Option B is incorrect because authorization rules control access to specific target networks, but the fundamental routing issue prevents any traffic from reaching the VPC. Option D is incorrect because split-tunneling is about routing client traffic; the routing issue here is on the AWS side, not the client side.
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 associated with the Client VPN endpoint does not allow inbound traffic from the client CIDR.
Why it's wrong here
The security group is for the endpoint itself, not for traffic to VPC.
- ✗
The authorization rules do not grant access to the target subnets.
Why it's wrong here
Authorization rules control access, but not routing.
- ✓
The route table of the subnet where the Client VPN endpoint is attached does not have a route to the VPC CIDR.
Why this is correct
Without a route, traffic from clients won't reach VPC resources.
- ✗
The Client VPN endpoint is configured with full-tunneling instead of split-tunneling.
Why it's wrong here
Full-tunneling would route all traffic through VPN, not prevent access.
Visual reference
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Same concept, more angles
1 more way this is tested on ANS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is setting up an AWS Client VPN endpoint for remote access. Users report they can connect to the VPN but cannot access resources in the VPC. The VPN endpoint is associated with a subnet that has a route table with a route to an internet gateway. The security group for the VPN endpoint allows all traffic. What could be the issue?
easy- ✓ A.The route table associated with the VPN subnet does not have a route to the VPC CIDR
- B.The authorization rules for the VPN endpoint do not include the VPC CIDR
- C.The security group for the VPN endpoint does not allow outbound traffic
- D.The client CIDR range overlaps with the VPC CIDR
Why A: The VPN endpoint is associated with a subnet, and that subnet's route table must include a route to the VPC CIDR to allow traffic from VPN clients to reach VPC resources. Without this route, packets from VPN clients are dropped because the subnet does not know how to forward them to the VPC. Option A is correct. Option B is incorrect because authorization rules control user access to specific destinations, but they do not affect routing; if the route is missing, traffic never reaches the VPC regardless of authorization. Option C is incorrect because the security group allows all traffic, so it is not blocking access. Option D is incorrect because while client CIDR overlap could cause issues, users can connect to the VPN, indicating no overlap; the primary issue is the missing route.
Last reviewed: Jun 20, 2026
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