ANS-C01 Network Implementation Practice Question
A company has a multi-account AWS Organizations setup with hundreds of VPCs across multiple regions. The network team needs to centralize outbound internet traffic through a set of inspection VPCs for security monitoring. Which solution is MOST scalable and cost-effective?
⚠ Common exam trap
It's easy for candidates to assume VPC peering can be used for transitive routing (Option D), but AWS explicitly prohibits transitive routing through VPC peering, making Transit Gateway the only scalable solution for hub-and-spoke egress with hundreds of VPCs.
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 with a central inspection VPC that has a NAT Gateway and route all VPCs to the inspection VPC for egress.
A Transit Gateway with a central inspection VPC centralizes egress traffic through a single NAT Gateway, eliminating the need for per-VPC NAT Gateways. This architecture scales horizontally by attaching hundreds of VPCs to the Transit Gateway and routing all 0.0.0.0/0 traffic to the inspection VPC, which is cost-effective as it reduces NAT Gateway hourly charges and data processing costs across multiple regions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use a Network Load Balancer in each VPC to distribute traffic to inspection appliances.
Why it's wrong here
NLB does not provide internet egress.
- ✓
Create a Transit Gateway with a central inspection VPC that has a NAT Gateway and route all VPCs to the inspection VPC for egress.
Why this is correct
Scalable, centralized, and cost-effective.
- ✗
Deploy a NAT Gateway in each VPC and route traffic directly to the internet.
Why it's wrong here
No central inspection; high cost.
- ✗
Set up VPC peering between all VPCs and route traffic through a single VPC with an Internet Gateway.
Why it's wrong here
VPC peering is not transitive and does not scale.
Visual reference
Go deeper
Related to this question
About these practice questions
Courseiva writes every ANS-C01 question from scratch — 1,621 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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.