ANS-C01 Network Design Practice Question
A company has a hybrid network with multiple VPCs connected via a Transit Gateway. They need to centralize outbound internet traffic through a single VPC. Which architecture should be used?
⚠ Common exam trap
Candidates often assume each VPC needs its own NAT Gateway or Internet Gateway for internet access, overlooking the Transit Gateway's ability to centralize egress traffic by manipulating route tables and attachment routing.
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
✓
Designate one VPC as an egress VPC with a NAT Gateway and Internet Gateway, and use Transit Gateway route tables to route 0.0.0.0/0 from other VPCs to the egress VPC.
It uses a dedicated egress VPC with a NAT Gateway and Internet Gateway, and leverages Transit Gateway route tables to direct 0.0.0.0/0 traffic from all other VPCs to this central point. This architecture centralizes outbound internet traffic, avoids overlapping NAT responsibilities, and maintains a clean hub-and-spoke design where only the egress VPC has direct internet access.
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 a NAT Gateway to each VPC's private subnets.
Why it's wrong here
This decentralizes outbound traffic.
- ✗
Attach an Internet Gateway to each VPC and route 0.0.0.0/0 to the IGW.
Why it's wrong here
This does not centralize traffic.
- ✓
Designate one VPC as an egress VPC with a NAT Gateway and Internet Gateway, and use Transit Gateway route tables to route 0.0.0.0/0 from other VPCs to the egress VPC.
Why this is correct
This centralizes outbound traffic through a single VPC.
- ✗
Use a VPN connection to an on-premises data center for internet access.
Why it's wrong here
VPN is not for internet access.
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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.