- A
Create VPC peering connections between each account's VPC and the central VPC.
Why wrong: Peering does not enable centralized inspection; traffic flows directly.
- B
Use AWS Transit Gateway with a central inspection VPC that has firewall appliances.
TGW enables hub-and-spoke architecture with inspection.
- C
Use VPC endpoints to route traffic to the central VPC.
Why wrong: VPC endpoints are for accessing services, not routing inter-VPC traffic.
- D
Deploy a Network Load Balancer in each VPC and route traffic through it.
Why wrong: NLB does not inspect traffic.
Question 474 of 1,705
Architecting Centralized VPC Traffic Inspection Using AWS Transit Gateway for Multi-Account Environments
This ANS-C01 practice question tests your understanding of network implementation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is setting up a new AWS account and wants to centrally manage VPC network traffic inspection across multiple accounts using a central VPC. The company uses AWS Organizations. Which architecture meets these requirements?
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
✓
Use AWS Transit Gateway with a central inspection VPC that has firewall appliances.
AWS Transit Gateway acts as a hub-and-spoke router, enabling centralized network traffic inspection by routing inter-VPC and VPN traffic through a central inspection VPC that hosts firewall appliances (e.g., third-party NGFWs or AWS Network Firewall). This architecture scales across multiple accounts in AWS Organizations using resource sharing via AWS Resource Access Manager, and it supports granular route tables to force traffic through the inspection VPC without requiring peering mesh or single points of failure.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create VPC peering connections between each account's VPC and the central VPC.
Why it's wrong here
Peering does not enable centralized inspection; traffic flows directly.
- ✓
Use AWS Transit Gateway with a central inspection VPC that has firewall appliances.
Why this is correct
TGW enables hub-and-spoke architecture with inspection.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use VPC endpoints to route traffic to the central VPC.
Why it's wrong here
VPC endpoints are for accessing services, not routing inter-VPC traffic.
- ✗
Deploy a Network Load Balancer in each VPC and route traffic through it.
Why it's wrong here
NLB does not inspect traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that VPC peering can be used for transitive routing (i.e., routing traffic through a third VPC), but VPC peering is non-transitive and cannot forward traffic between two peered VPCs via a central VPC.
Detailed technical explanation
How to think about this question
Transit Gateway uses route tables with static and propagated routes to direct traffic; for inspection, you create a 'black hole' route or a specific route pointing to the inspection VPC's appliance ENI, and the inspection VPC returns traffic to the Transit Gateway for final delivery. This design supports asymmetric routing scenarios (e.g., traffic from spoke VPC A to spoke VPC B is forced through the inspection VPC) by leveraging Transit Gateway route table associations and propagations. In a real-world deployment, you must carefully configure route table entries to avoid routing loops, and you can use AWS Network Firewall or third-party appliances (e.g., Palo Alto, Fortinet) in the inspection VPC for stateful inspection.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use AWS Transit Gateway with a central inspection VPC that has firewall appliances. — AWS Transit Gateway acts as a hub-and-spoke router, enabling centralized network traffic inspection by routing inter-VPC and VPN traffic through a central inspection VPC that hosts firewall appliances (e.g., third-party NGFWs or AWS Network Firewall). This architecture scales across multiple accounts in AWS Organizations using resource sharing via AWS Resource Access Manager, and it supports granular route tables to force traffic through the inspection VPC without requiring peering mesh or single points of failure.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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