ANS-C01 Network Security, Compliance and Governance Practice Question
A company is deploying an AWS Network Firewall in a centralized inspection VPC and needs to send traffic from multiple VPCs through it. The VPCs are attached to a Transit Gateway. What configuration is required to route traffic to the firewall?
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
✓
Create a Transit Gateway route table with a route to the Network Firewall endpoint and attach the VPCs to it.
The Transit Gateway route table must have a route pointing to the Network Firewall endpoint, and the VPCs attached to that route table will have their traffic inspected by the firewall. Options B, C, and D are incorrect: VPC Gateway Endpoints are for accessing AWS services, not for routing traffic through a firewall; adding routes directly to the firewall's ENI in each VPC subnet is not supported without an endpoint; and NAT gateways are used for outbound internet traffic, not for routing to a firewall.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create a Transit Gateway route table with a route to the Network Firewall endpoint and attach the VPCs to it.
Why this is correct
This ensures traffic is routed through the firewall.
- ✗
Create a VPC Gateway Endpoint for the firewall service.
Why it's wrong here
Gateway Endpoints are used for S3 and DynamoDB, not for firewall services.
- ✗
Add a route in each VPC's subnet routing table pointing to the firewall's elastic network interface.
Why it's wrong here
The firewall is in a different VPC; you cannot route directly to its ENI across VPCs without Transit Gateway.
- ✗
Configure a NAT gateway in each VPC and route traffic through it.
Why it's wrong here
NAT gateways are for outbound internet traffic, not for traffic inspection.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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