- A
Attach all VPCs to a Transit Gateway. Create separate route tables: one for inspection VPC attachments and one for others. In VPC A's route table, route to VPC B via the inspection VPC attachment.
This design uses Transit Gateway route tables to force traffic through the inspection VPC.
- B
Create a VPC peering connection between VPC A and VPC B, and attach firewall appliances in both VPCs.
Why wrong: VPC peering does not support transitive routing; traffic would go directly.
- C
Use AWS PrivateLink to create VPC endpoints in VPC A and VPC B, and route traffic through the firewall VPC.
Why wrong: PrivateLink is for accessing services, not for routing VPC-to-VPC traffic.
- D
Deploy AWS Network Firewall in each VPC and configure VPC route tables to send traffic to the firewall endpoint.
Why wrong: This is a valid approach but does not use Transit Gateway as specified.
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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 uses AWS Transit Gateway to connect multiple VPCs and on-premises networks via AWS Site-to-Site VPN. The security team wants to inspect all traffic between VPCs using a centralized inspection VPC with third-party firewall appliances. Which architecture ensures that traffic from VPC A to VPC B is routed through the inspection VPC?
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
Attach all VPCs to a Transit Gateway. Create separate route tables: one for inspection VPC attachments and one for others. In VPC A's route table, route to VPC B via the inspection VPC attachment.
Option A is correct because it uses separate Transit Gateway route tables to isolate the inspection VPC and other VPCs. By configuring the route table for VPC A to point to VPC B's CIDR via the inspection VPC attachment, all inter-VPC traffic is forced through the centralized firewall appliances. This leverages Transit Gateway's ability to route traffic between attachments based on route table associations and propagations, ensuring traffic flows through the inspection VPC without requiring VPC peering or additional per-VPC firewalls.
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.
- ✓
Attach all VPCs to a Transit Gateway. Create separate route tables: one for inspection VPC attachments and one for others. In VPC A's route table, route to VPC B via the inspection VPC attachment.
Why this is correct
This design uses Transit Gateway route tables to force traffic through the inspection VPC.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a VPC peering connection between VPC A and VPC B, and attach firewall appliances in both VPCs.
Why it's wrong here
VPC peering does not support transitive routing; traffic would go directly.
- ✗
Use AWS PrivateLink to create VPC endpoints in VPC A and VPC B, and route traffic through the firewall VPC.
Why it's wrong here
PrivateLink is for accessing services, not for routing VPC-to-VPC traffic.
- ✗
Deploy AWS Network Firewall in each VPC and configure VPC route tables to send traffic to the firewall endpoint.
Why it's wrong here
This is a valid approach but does not use Transit Gateway as specified.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is assuming that simply attaching all VPCs to a Transit Gateway automatically routes traffic through a centralized inspection VPC, when in fact you must explicitly configure separate route tables and static routes to force traffic through the inspection VPC, otherwise Transit Gateway uses its default route table for direct attachment-to-attachment routing.
Detailed technical explanation
How to think about this question
Transit Gateway uses separate route tables to control traffic flow between attachments; by associating VPC A and VPC B with a route table that has a static route for the other VPC's CIDR pointing to the inspection VPC attachment, traffic is forced through the firewall. The inspection VPC itself must have route tables that forward traffic between its attachments (e.g., to the firewall appliances) and back, often using EC2 instances or Gateway Load Balancers for stateful inspection. In a real-world scenario, this architecture supports east-west traffic inspection while maintaining high availability by deploying multiple firewall instances across Availability Zones.
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.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Attach all VPCs to a Transit Gateway. Create separate route tables: one for inspection VPC attachments and one for others. In VPC A's route table, route to VPC B via the inspection VPC attachment. — Option A is correct because it uses separate Transit Gateway route tables to isolate the inspection VPC and other VPCs. By configuring the route table for VPC A to point to VPC B's CIDR via the inspection VPC attachment, all inter-VPC traffic is forced through the centralized firewall appliances. This leverages Transit Gateway's ability to route traffic between attachments based on route table associations and propagations, ensuring traffic flows through the inspection VPC without requiring VPC peering or additional per-VPC firewalls.
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: Jun 11, 2026
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