ANS-C01 Network Design Practice Question
A company has a VPC with multiple subnets. The security team requires that all outbound traffic from the VPC to the internet goes through a centralized firewall. Which design should be used?
⚠ Common exam trap
Many candidates assume an Internet Gateway is required for internet access and overlook the need for centralized inspection, leading them to choose Option B without considering the security constraint.
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
✓
Route all internet traffic through a centralized inspection VPC using Transit Gateway.
It uses a Transit Gateway to route all outbound internet traffic from the VPC to a centralized inspection VPC, where a firewall (e.g., AWS Network Firewall or a third-party appliance) inspects and forwards traffic to an Internet Gateway. This design meets the security requirement by enforcing a single egress point, ensuring all traffic is inspected before reaching the internet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Route all internet traffic through a centralized inspection VPC using Transit Gateway.
Why this is correct
Enforces centralized firewall.
- ✗
Attach an Internet Gateway to each VPC.
Why it's wrong here
No central inspection.
- ✗
Use AWS Site-to-Site VPN to a third-party firewall.
Why it's wrong here
Not for internet egress.
- ✗
Use VPC Endpoints for all services.
Why it's wrong here
Not for internet.
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Same concept, more angles
1 more way this is tested on ANS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company has a VPC with multiple subnets. The security team requires that all outbound traffic from the VPC to the internet must traverse a centralized inspection appliance for traffic inspection. Which architecture should be used?
hard- A.Use VPC Peering between all VPCs
- B.Configure a NAT Gateway in each Availability Zone
- ✓ C.Use Transit Gateway with VPC attached and route traffic through a shared services VPC containing the inspection appliance
- D.Use AWS Direct Connect to route traffic on-premises
Why C: A Transit Gateway with a shared services VPC architecture allows centralized inspection of all outbound internet traffic. By attaching the VPCs to a Transit Gateway and routing traffic through a shared services VPC that hosts the inspection appliance (e.g., a firewall or proxy), you can enforce security policies. The Transit Gateway acts as a hub, enabling transitive routing between VPCs while directing internet-bound traffic to the inspection appliance before it reaches an internet gateway or NAT gateway.
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.