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 on-premises networks. They need to ensure that traffic between VPCs is inspected by a network virtual appliance. Which architecture should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an inspection VPC with the appliance. Configure Transit Gateway route tables to send inter-VPC traffic to the inspection VPC attachment.
Option C is correct because it uses an inspection VPC as a central point for traffic inspection. By attaching the network virtual appliance to a dedicated inspection VPC and configuring Transit Gateway route tables to route inter-VPC traffic to that attachment, all traffic between VPCs is forced through the appliance for inspection. This leverages Transit Gateway's ability to route traffic between attachments based on route table entries, enabling centralized security enforcement without complex peering or per-VPC appliance deployments.
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 a Network Load Balancer in each VPC to forward traffic to the appliance.
Why it's wrong here
Does not provide centralized inspection.
✗
Attach the appliance directly to each VPC using VPC Peering.
Why it's wrong here
VPC Peering does not support transitive routing.
✓
Create an inspection VPC with the appliance. Configure Transit Gateway route tables to send inter-VPC traffic to the inspection VPC attachment.
Why this is correct
This allows traffic to be routed through the appliance for inspection.
Related concept
Read the scenario before looking for a memorised answer.
✗
Place the appliance in each VPC and configure VPC Peering.
Why it's wrong here
Not scalable.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that you can simply attach a virtual appliance to a Transit Gateway and have it automatically inspect all traffic, but the trap here is that you must explicitly configure Transit Gateway route tables to route inter-VPC traffic to the inspection VPC attachment, otherwise traffic will flow directly between VPC attachments without inspection.
Detailed technical explanation
How to think about this question
Transit Gateway route tables support blackhole routes and static routes that can point to an inspection VPC attachment. By creating a route table for each VPC that sends all inter-VPC traffic (e.g., 10.0.0.0/8) to the inspection VPC attachment, and then configuring the inspection VPC's route table to forward inspected traffic to the destination VPC attachments, you create a forced-tunneling pattern. This design is often used with AWS Network Firewall or third-party appliances, and it requires careful handling of asymmetric routing by ensuring the appliance performs stateful inspection or uses Source NAT to maintain flow symmetry.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 an inspection VPC with the appliance. Configure Transit Gateway route tables to send inter-VPC traffic to the inspection VPC attachment. — Option C is correct because it uses an inspection VPC as a central point for traffic inspection. By attaching the network virtual appliance to a dedicated inspection VPC and configuring Transit Gateway route tables to route inter-VPC traffic to that attachment, all traffic between VPCs is forced through the appliance for inspection. This leverages Transit Gateway's ability to route traffic between attachments based on route table entries, enabling centralized security enforcement without complex peering or per-VPC appliance deployments.
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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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.
Question Discussion
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