- A
Use Network ACLs on the subnets to restrict traffic and allow inspection.
Why wrong: NACLs are stateless and cannot route traffic; they only filter traffic at the subnet level.
- B
Create VPC peering connections between all VPCs and route traffic through a security appliance in a central VPC.
Why wrong: VPC peering is a one-to-one connection; routing through a central VPC would require multiple peering connections and complex routing.
- C
Use security groups on the security appliance to inspect traffic.
Why wrong: Security groups are stateful firewalls for instances, not for routing traffic.
- D
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.
Transit Gateway route tables allow you to centralize routing through an inspection VPC.
ANS-C01 Network Design Practice Question
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 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?
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.
Option D is correct because 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.
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.
- ✗
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.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often 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.
Detailed technical explanation
How to think about this question
Transit Gateway uses route tables to control traffic flow between attachments. By creating separate route tables for the inspection VPC and other VPCs, you can use static routes with a blackhole or specific next-hop to the inspection VPC's attachment. This design leverages the transitive routing capability of Transit Gateway, which VPC peering lacks, and allows for scalable, centralized inspection without requiring multiple VPN connections or complex routing policies.
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 Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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. — Option D is correct because 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.
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 24, 2026
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