ANS-C01 Network Implementation Practice Question
A company is implementing a multi-region architecture with VPCs in us-east-1 and eu-west-1. They want to connect these VPCs using a Transit Gateway and ensure that traffic between regions can be inspected by a firewall in us-east-1. Which configuration is required?
⚠ Common exam trap
Candidates often confuse VPC peering (which is non-transitive) with Transit Gateway peering (which supports transitive routing through inspection VPCs), leading them to select Option C incorrectly.
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 in each region, peer them, and configure route tables to send inter-region traffic through the inspection VPC in us-east-1.
It uses Transit Gateway inter-region peering to connect the two regions, and by attaching an inspection VPC (with a firewall) in us-east-1 to the Transit Gateway, you can route all inter-region traffic through that VPC for inspection. The Transit Gateway route tables in each region are configured to send traffic destined for the other region to the inspection VPC attachment, ensuring traffic is inspected before being forwarded.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Establish a VPN connection between the two VPCs and route traffic through the firewall.
Why it's wrong here
VPN would work but does not provide the scalability and flexibility of Transit Gateway peering.
- ✓
Create a Transit Gateway in each region, peer them, and configure route tables to send inter-region traffic through the inspection VPC in us-east-1.
Why this is correct
Transit Gateway peering enables cross-region connectivity, and route tables can steer traffic for inspection.
- ✗
Create a VPC peering connection between the two VPCs and update route tables.
Why it's wrong here
VPC peering is not transitive and cannot be used with Transit Gateway for centralized inspection.
- ✗
Use a Direct Connect gateway to connect the two VPCs directly.
Why it's wrong here
Direct Connect gateways are used for on-premises connections, not for inter-region VPC connections.
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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.