- A
Deploy a Gateway Load Balancer (GWLB) in the spoke VPC and route traffic to it.
Why wrong: GWLB is used for transparent inspection, but it requires additional configuration and does not inherently route traffic to the inspection VPC.
- B
Use AWS Transit Gateway with VPC attachments and configure route tables to force traffic between the two instances through the inspection VPC.
Transit Gateway can be configured with route tables that send inter-VPC traffic to the inspection VPC for firewall inspection.
- C
Enable VPC peering and use route propagation to send traffic to the inspection VPC.
Why wrong: VPC peering does not support transitive routing; route propagation is for VPN.
- D
Create a VPC peering connection between the two instances' VPCs.
Why wrong: VPC peering bypasses the Transit Gateway and the inspection VPC, so traffic will not be inspected.
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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 centralized inspection VPC architecture where all traffic from spoke VPCs is routed through a Transit Gateway to a centralized VPC that hosts firewall appliances (NGFW). The company needs to inspect traffic between two instances in the same spoke VPC. What is the simplest way to achieve this?
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
Use AWS Transit Gateway with VPC attachments and configure route tables to force traffic between the two instances through the inspection VPC.
Option B is correct because AWS Transit Gateway can route traffic between instances in the same spoke VPC by using VPC attachments and route tables to force the traffic through the centralized inspection VPC. This is achieved by configuring the spoke VPC's route table to send inter-instance traffic to the Transit Gateway, which then forwards it to the inspection VPC for firewall inspection before returning it to the destination instance. This approach avoids the need for additional appliances or complex routing within the spoke VPC itself.
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.
- ✗
Deploy a Gateway Load Balancer (GWLB) in the spoke VPC and route traffic to it.
Why it's wrong here
GWLB is used for transparent inspection, but it requires additional configuration and does not inherently route traffic to the inspection VPC.
- ✓
Use AWS Transit Gateway with VPC attachments and configure route tables to force traffic between the two instances through the inspection VPC.
- ✗
Enable VPC peering and use route propagation to send traffic to the inspection VPC.
Why it's wrong here
VPC peering does not support transitive routing; route propagation is for VPN.
- ✗
Create a VPC peering connection between the two instances' VPCs.
Why it's wrong here
VPC peering bypasses the Transit Gateway and the inspection VPC, so traffic will not be inspected.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that VPC peering can be used for transitive routing or that a Gateway Load Balancer alone can redirect traffic within the same VPC, but the key trap here is that candidates overlook the Transit Gateway's ability to hairpin traffic from the same spoke VPC through a central inspection VPC using proper route table configurations.
Detailed technical explanation
How to think about this question
Under the hood, Transit Gateway uses route tables to control traffic flow; by adding a static route in the spoke VPC's route table for the destination instance's IP range pointing to the Transit Gateway attachment, and configuring the Transit Gateway route table to forward that traffic to the inspection VPC attachment, traffic is hair-pinned through the inspection VPC. This method relies on the Transit Gateway's ability to perform transitive routing, which is not supported by VPC peering. In real-world scenarios, this design is common for east-west traffic inspection within a large VPC, where the inspection VPC hosts NGFWs that enforce security 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 Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use AWS Transit Gateway with VPC attachments and configure route tables to force traffic between the two instances through the inspection VPC. — Option B is correct because AWS Transit Gateway can route traffic between instances in the same spoke VPC by using VPC attachments and route tables to force the traffic through the centralized inspection VPC. This is achieved by configuring the spoke VPC's route table to send inter-instance traffic to the Transit Gateway, which then forwards it to the inspection VPC for firewall inspection before returning it to the destination instance. This approach avoids the need for additional appliances or complex routing within the spoke VPC itself.
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 30, 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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