ANS-C01 Network Implementation Practice Question
A company has multiple VPCs connected via a Transit Gateway. The security team wants to centrally inspect all traffic between VPCs using a third-party firewall appliance. The appliance must be deployed in a single VPC and all inter-VPC traffic must be routed through it. Which architecture should be used?
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that VPC peering can be used for transitive routing, but in AWS, VPC peering does not support transitive routing, so traffic cannot be routed through a third VPC without a Transit Gateway or a more complex hub‑and‑spoke design.
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
✓
Configure the Transit Gateway with a central inspection VPC that hosts the firewall appliance
A Transit Gateway supports centralised inspection by attaching a dedicated inspection VPC that hosts the third‑party firewall appliance. By adjusting the Transit Gateway route tables, all inter‑VPC traffic can be forced through the inspection VPC using static routes or a default route pointing to the firewall’s elastic network interface, enabling full traffic inspection without modifying individual VPC route tables.
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 the Transit Gateway with a central inspection VPC that hosts the firewall appliance
Why this is correct
Transit Gateway supports central inspection by routing traffic through a dedicated inspection VPC.
- ✗
Create a Network Load Balancer in each VPC and point to the firewall
Why it's wrong here
NLB is for load balancing, not routing all traffic through a firewall.
- ✗
Deploy AWS Network Firewall in each VPC
Why it's wrong here
AWS Network Firewall is a managed service, not a third-party appliance.
- ✗
Use 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, so traffic between non-peered VPCs cannot be centrally inspected.
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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.