ANS-C01 Network Security, Compliance and Governance Practice Question
A company uses AWS Transit Gateway to connect multiple VPCs and on-premises networks. The security team wants to ensure that traffic between VPCs is inspected by a centralized firewall appliance in a inspection VPC. Which architecture meets this requirement?
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
✓
Attach all VPCs to a Transit Gateway and create separate route tables for inspection.
Transit Gateway route tables can direct traffic between VPCs through a central inspection VPC by using route propagation and appropriate route table associations. Option A is wrong because VPC peering does not support transitive routing; traffic would need to traverse multiple non-transitive connections, and peering alone cannot force traffic through a centralized firewall. Option B is wrong because deploying AWS Network Firewall in each VPC does not centralize inspection; traffic between VPCs would flow directly unless routing forces it through the firewall, which is not described. Option D is wrong because AWS Direct Connect Gateway is used for connecting on-premises networks to AWS, not for routing traffic between VPCs through an inspection VPC.
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 VPC peering connections between all VPCs and route traffic through the inspection VPC.
Why it's wrong here
VPC peering does not support transitive routing; traffic cannot be forced through a central VPC.
- ✗
Deploy AWS Network Firewall in each VPC and allow traffic to flow directly between VPCs.
Why it's wrong here
This would require separate firewall management per VPC, not centralized inspection.
- ✓
Attach all VPCs to a Transit Gateway and create separate route tables for inspection.
Why this is correct
Transit Gateway with route tables can direct inter-VPC traffic to a inspection VPC for centralized inspection.
- ✗
Use AWS Direct Connect Gateway to route traffic between VPCs through the inspection VPC.
Why it's wrong here
Direct Connect is for on-premises connectivity, not inter-VPC traffic.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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