- A
Configure Transit Gateway route tables to send inter-VPC traffic to the inspection VPC's attachment, and enable appliance mode on the attachment.
Appliance mode ensures that return traffic is sent back through the same firewall, enabling stateful inspection.
- B
Create VPC peering connections between all VPCs and route traffic through the central VPC.
Why wrong: VPC peering does not support transitive routing; each pair requires a direct connection.
- C
Use a Network Load Balancer in the central VPC to distribute traffic to the firewall appliances.
Why wrong: NLB does not perform packet inspection; it only load balances.
- D
Set up Direct Connect gateways and route all traffic through the on-premises network for inspection.
Why wrong: This adds unnecessary latency and complexity, and does not use Transit Gateway.
Quick Answer
The correct answer is to configure Transit Gateway route tables to send inter-VPC traffic to the inspection VPC's attachment and enable appliance mode on that attachment. This works because appliance mode forces the Transit Gateway to preserve the source MAC address and enable asymmetric routing, which is essential when a third-party firewall in a central VPC must inspect bidirectional traffic without dropping packets due to reverse-path filtering. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of centralized inspection patterns and the critical distinction between standard Transit Gateway routing and appliance mode—a common trap is assuming a Network Load Balancer or VPC peering can handle stateful inspection, but neither supports deep packet inspection or asymmetric flow handling. Remember the key memory tip: "Appliance mode for asymmetric flow, route tables to steer the show."
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.
An organization uses AWS Transit Gateway to connect multiple VPCs and on-premises networks via VPN. They want to implement traffic inspection between VPCs using a third-party firewall appliance in a central VPC. The firewall must inspect traffic for all inter-VPC flows. Which architecture meets this requirement?
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
Configure Transit Gateway route tables to send inter-VPC traffic to the inspection VPC's attachment, and enable appliance mode on the attachment.
Option D is correct because Transit Gateway with appliance mode (enabling asymmetric routing) and appropriate route tables can force traffic through the inspection VPC. Option A is wrong because VPC peering does not allow centralized inspection without complex routing. Option B is wrong because Network Load Balancer does not support traffic inspection. Option C is wrong because Direct Connect alone does not provide inspection.
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.
- ✓
Configure Transit Gateway route tables to send inter-VPC traffic to the inspection VPC's attachment, and enable appliance mode on the attachment.
Why this is correct
Appliance mode ensures that return traffic is sent back through the same firewall, enabling stateful inspection.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create VPC peering connections between all VPCs and route traffic through the central VPC.
Why it's wrong here
VPC peering does not support transitive routing; each pair requires a direct connection.
- ✗
Use a Network Load Balancer in the central VPC to distribute traffic to the firewall appliances.
Why it's wrong here
NLB does not perform packet inspection; it only load balances.
- ✗
Set up Direct Connect gateways and route all traffic through the on-premises network for inspection.
Why it's wrong here
This adds unnecessary latency and complexity, and does not use Transit Gateway.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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: Configure Transit Gateway route tables to send inter-VPC traffic to the inspection VPC's attachment, and enable appliance mode on the attachment. — Option D is correct because Transit Gateway with appliance mode (enabling asymmetric routing) and appropriate route tables can force traffic through the inspection VPC. Option A is wrong because VPC peering does not allow centralized inspection without complex routing. Option B is wrong because Network Load Balancer does not support traffic inspection. Option C is wrong because Direct Connect alone does not provide inspection.
What should I do if I get this ANS-C01 question wrong?
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 20, 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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