- A
Deploy AWS Network Firewall in each VPC and configure VPC peering between VPCs.
Why wrong: This does not provide centralized management and inspection of inter-VPC traffic without additional routing.
- B
Deploy AWS Network Firewall in a shared services VPC and use VPC peering to connect all VPCs.
Why wrong: VPC peering is point-to-point and does not support transitive routing, so traffic would not go through the firewall automatically.
- C
Use AWS Transit Gateway and attach AWS Network Firewall as a VPC attachment to the transit gateway.
This centralizes inspection and routes traffic through the firewall with minimal latency.
- D
Use a centralized inspection VPC with a Gateway Load Balancer and third-party appliances.
Why wrong: While this works, the question specifically asks for AWS Network Firewall, which is a managed service that can be attached directly to Transit Gateway.
Deploy AWS Network Firewall as a Transit Gateway VPC Attachment for Low-Latency Inter-VPC Inspection
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 has multiple AWS accounts and wants to centrally manage network security using AWS Network Firewall. The firewall must inspect traffic between VPCs in the same Region. Which deployment model achieves this with minimal latency?
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 and attach AWS Network Firewall as a VPC attachment to the transit gateway.
AWS Transit Gateway enables a hub-and-spoke architecture where all VPCs route traffic through a central inspection VPC. By attaching AWS Network Firewall as a VPC attachment to the transit gateway, traffic between VPCs is routed through the firewall for inspection with minimal latency because the firewall is deployed inline within the transit gateway route table, avoiding the overhead of multiple peering connections or third-party appliances.
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.
- ✗
Deploy AWS Network Firewall in each VPC and configure VPC peering between VPCs.
Why it's wrong here
This does not provide centralized management and inspection of inter-VPC traffic without additional routing.
- ✗
Deploy AWS Network Firewall in a shared services VPC and use VPC peering to connect all VPCs.
Why it's wrong here
VPC peering is point-to-point and does not support transitive routing, so traffic would not go through the firewall automatically.
- ✓
Use AWS Transit Gateway and attach AWS Network Firewall as a VPC attachment to the transit gateway.
Why this is correct
This centralizes inspection and routes traffic through the firewall with minimal latency.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a centralized inspection VPC with a Gateway Load Balancer and third-party appliances.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse VPC peering with transitive routing, assuming that connecting all VPCs to a central VPC via peering allows traffic to flow through the firewall, but VPC peering does not support transitive routing, so traffic between two spoke VPCs would not be inspected unless explicitly routed through the central VPC, which is not natively supported.
Detailed technical explanation
How to think about this question
AWS Network Firewall integrates with Transit Gateway by being deployed in a dedicated inspection VPC that is attached to the transit gateway. The transit gateway route tables are configured to route inter-VPC traffic through the firewall endpoint using a blackhole route or a specific route pointing to the firewall's VPC attachment, enabling stateful inspection with sub-millisecond latency. This model supports centralized logging and policy management across multiple VPCs without the need for complex routing or additional load balancers.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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 and attach AWS Network Firewall as a VPC attachment to the transit gateway. — AWS Transit Gateway enables a hub-and-spoke architecture where all VPCs route traffic through a central inspection VPC. By attaching AWS Network Firewall as a VPC attachment to the transit gateway, traffic between VPCs is routed through the firewall for inspection with minimal latency because the firewall is deployed inline within the transit gateway route table, avoiding the overhead of multiple peering connections or third-party appliances.
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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