ANS-C01 Network Implementation Practice Question
A company is using AWS Transit Gateway to connect multiple VPCs and on-premises networks. The company wants to centralize network security by inspecting all traffic between VPCs and between VPCs and on-premises. Which architecture should be used?
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that VPC peering or VPN meshes can achieve centralized inspection, but the trap is that only Transit Gateway with a dedicated inspection VPC provides transitive routing and a single point of policy enforcement without requiring a full mesh of connections.
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 use route tables to send traffic through a firewall appliance in one VPC.
AWS Transit Gateway supports centralized routing through a shared services VPC. By attaching all VPCs and VPN connections to the Transit Gateway and configuring route tables to point default or inter-VPC routes to a network firewall appliance (e.g., a third-party firewall or AWS Network Firewall) in a dedicated inspection VPC, all traffic between VPCs and between VPCs and on-premises can be forced through the firewall for inspection. This architecture leverages Transit Gateway route tables and blackhole routes to enforce traffic steering without requiring complex peering or VPN meshes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Attach all VPCs to a Transit Gateway and use route tables to send traffic through a firewall appliance in one VPC.
Why this is correct
Transit Gateway route tables can direct traffic to a inspection VPC.
- ✗
Use VPN connections between all VPCs and on-premises.
Why it's wrong here
No centralized inspection.
- ✗
Use VPC peering between all VPCs and configure security groups.
Why it's wrong here
No centralized inspection.
- ✗
Use Network Load Balancer to distribute traffic across VPCs.
Why it's wrong here
NLB is for load balancing, not routing.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.