Question 425 of 1,621
ANS-C01 Network Design Practice Question
A company is using AWS Transit Gateway to connect multiple VPCs and an on-premises network via AWS Direct Connect. They need to ensure that traffic between VPCs is inspected by a centralized security appliance. How should they design the routing?
⚠ Common exam trap
Many candidates confuse the transitive routing capability of Transit Gateway with VPC peering, assuming VPC peering can route through a central VPC, but VPC peering does not support transitive routing, making Option B invalid.
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
✓
Create a Transit Gateway with separate route tables. Attach each VPC and the Direct Connect virtual interface to the Transit Gateway. In the route tables, propagate routes and add static routes to send inter-VPC traffic to the security appliance VPC.
AWS Transit Gateway supports separate route tables, allowing you to isolate traffic domains. By attaching each VPC and the Direct Connect virtual interface to the Transit Gateway, you can create a centralized inspection VPC. Static routes in the Transit Gateway route tables direct inter-VPC traffic to the security appliance VPC, ensuring all traffic between VPCs is inspected before reaching its destination.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use Network ACLs on the subnets to restrict traffic and allow inspection.
Why it's wrong here
NACLs are stateless and cannot route traffic; they only filter traffic at the subnet level.
- ✗
Create VPC peering connections between all VPCs and route traffic through a security appliance in a central VPC.
Why it's wrong here
VPC peering is a one-to-one connection; routing through a central VPC would require multiple peering connections and complex routing.
- ✗
Use security groups on the security appliance to inspect traffic.
Why it's wrong here
Security groups are stateful firewalls for instances, not for routing traffic.
- ✓
Create a Transit Gateway with separate route tables. Attach each VPC and the Direct Connect virtual interface to the Transit Gateway. In the route tables, propagate routes and add static routes to send inter-VPC traffic to the security appliance VPC.
Why this is correct
Transit Gateway route tables allow you to centralize routing through an inspection VPC.
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Last reviewed: Jun 24, 2026
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