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 has a VPC with multiple subnets. They want to enforce that all traffic between subnets must be inspected by a security appliance deployed in a centralized inspection VPC. Which AWS feature should be used to route traffic to the inspection VPC without changing the routing on each subnet?
VPC Peering
Why wrong: VPC peering connects VPCs but does not centralize routing.
Transit Gateway with route tables
Transit Gateway enables centralized routing and inspection.
NAT Gateway
Why wrong: NAT Gateway is for internet access, not inter-subnet routing.
Network Load Balancer
Why wrong: NLB is for load balancing, not routing between subnets.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Transit Gateway with route tables
A Transit Gateway with route tables allows central routing and inspection. Option A is wrong because VPC peering does not support centralized inspection easily. Option B is wrong because NAT Gateway is for outbound internet. Option D is wrong because a Network Load Balancer is for load balancing, not routing.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
VPC Peering
Why it's wrong here
VPC peering connects VPCs but does not centralize routing.
Transit Gateway with route tables
NAT Gateway
Network Load Balancer
Why it's wrong here
NLB is for load balancing, not routing between subnets.
Common exam traps
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
What to study next
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — CIDR notation defines the prefix length..
The correct answer is: Transit Gateway with route tables — A Transit Gateway with route tables allows central routing and inspection. Option A is wrong because VPC peering does not support centralized inspection easily. Option B is wrong because NAT Gateway is for outbound internet. Option D is wrong because a Network Load Balancer is for load balancing, not routing.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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