This ANS-C01 practice question tests your understanding of network design. 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 designs a multi-account AWS environment using AWS Organizations. The networking team wants a centralized inspection VPC for traffic between VPCs and on-premises. Which architecture ensures that all inter-VPC traffic passes through the inspection VPC?
VPC peering between all VPCs and the inspection VPC.
Why wrong: Peering is direct, doesn't force inspection.
AWS Network Firewall deployed in each VPC.
Why wrong: Distributed, not centralized.
AWS Transit Gateway with centralized routing to the inspection VPC.
Centralized routing enforces inspection.
AWS Direct Connect Gateway with virtual interfaces.
Why wrong: For on-premises, not inter-VPC.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
AWS Transit Gateway with centralized routing to the inspection VPC.
Option C is correct because AWS Transit Gateway enables centralized routing by attaching all VPCs and the on-premises network to a single transit gateway, then configuring route tables to force all inter-VPC traffic through a dedicated inspection VPC appliance (e.g., firewall or NGFW). This ensures traffic flows via the inspection VPC without requiring full-mesh peering or per-VPC firewalls.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
VPC peering between all VPCs and the inspection VPC.
Why it's wrong here
Peering is direct, doesn't force inspection.
AWS Network Firewall deployed in each VPC.
Why it's wrong here
Distributed, not centralized.
AWS Transit Gateway with centralized routing to the inspection VPC.
Why this is correct
Centralized routing enforces inspection.
Related concept
Read the scenario before looking for a memorised answer.
AWS Direct Connect Gateway with virtual interfaces.
Why it's wrong here
For on-premises, not inter-VPC.
Common exam traps
The trap here is that candidates often confuse VPC peering with transitive routing, assuming that peering multiple VPCs to a central VPC automatically routes traffic through it, but VPC peering does not support transitive routing—each peering connection is non-transitive, so traffic between two spoke VPCs would not go through the central VPC unless explicit routing is configured, which is complex and not natively supported.
Detailed technical explanation
Under the hood, Transit Gateway uses route tables and attachments to control traffic flow; by placing the inspection VPC as a central appliance (e.g., using a Gateway Load Balancer or third-party firewall), you can create a 'black hole' route or a default route pointing to the inspection VPC attachment, ensuring all inter-VPC traffic is redirected. In a real-world scenario, this architecture is critical for compliance (e.g., PCI DSS) where all traffic must be logged and inspected, and it avoids the scalability limits of VPC peering (e.g., 125 peering connections per VPC).
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
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FAQ
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
The correct answer is: AWS Transit Gateway with centralized routing to the inspection VPC. — Option C is correct because AWS Transit Gateway enables centralized routing by attaching all VPCs and the on-premises network to a single transit gateway, then configuring route tables to force all inter-VPC traffic through a dedicated inspection VPC appliance (e.g., firewall or NGFW). This ensures traffic flows via the inspection VPC without requiring full-mesh peering or per-VPC firewalls.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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.
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