- A
Deploy a Transit Gateway and attach a central inspection VPC with a firewall appliance. Configure route tables to send inter-VPC traffic through the inspection VPC.
This architecture allows centralized inspection of all traffic between VPCs by routing it through the inspection VPC.
- B
Create VPC Peering connections between each pair of application VPCs and apply security groups to the peer connections.
Why wrong: VPC Peering does not support security groups on peer connections; traffic between peered VPCs is filtered by security groups of instances, not centrally.
- C
Use security groups in each application VPC to control traffic between VPCs.
Why wrong: Security groups are applied to individual instances and do not filter traffic at the VPC level.
- D
Use network ACLs in each application VPC to filter traffic between VPCs.
Why wrong: Network ACLs operate at the subnet level within a VPC and cannot filter traffic between VPCs.
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 deploying a multi-tier web application across multiple AWS accounts. They want to centralize network security by using a shared services VPC with a Transit Gateway. All application VPCs will be attached to the Transit Gateway. The security team needs to inspect and filter traffic between application VPCs. Which solution should be used to meet 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
Deploy a Transit Gateway and attach a central inspection VPC with a firewall appliance. Configure route tables to send inter-VPC traffic through the inspection VPC.
Option A is correct because a Transit Gateway with a central inspection VPC allows you to route all inter-VPC traffic through a firewall appliance for inspection. By configuring route tables on the Transit Gateway, you can force traffic between application VPCs to traverse the inspection VPC, enabling centralized security filtering without requiring point-to-point peering or per-VPC rules.
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 Transit Gateway and attach a central inspection VPC with a firewall appliance. Configure route tables to send inter-VPC traffic through the inspection VPC.
Why this is correct
This architecture allows centralized inspection of all traffic between VPCs by routing it through the inspection VPC.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create VPC Peering connections between each pair of application VPCs and apply security groups to the peer connections.
Why it's wrong here
VPC Peering does not support security groups on peer connections; traffic between peered VPCs is filtered by security groups of instances, not centrally.
- ✗
Use security groups in each application VPC to control traffic between VPCs.
Why it's wrong here
Security groups are applied to individual instances and do not filter traffic at the VPC level.
- ✗
Use network ACLs in each application VPC to filter traffic between VPCs.
Why it's wrong here
Network ACLs operate at the subnet level within a VPC and cannot filter traffic between VPCs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that security groups or network ACLs can filter traffic between VPCs, but they are scoped to a single VPC and cannot inspect traffic traversing a Transit Gateway or VPC Peering connection.
Detailed technical explanation
How to think about this question
Under the hood, the Transit Gateway uses route tables to direct traffic; by adding a static route for the destination VPC CIDR with the inspection VPC attachment as the next hop, you create a 'black hole' or forced tunneling effect. The firewall appliance (e.g., a third-party NGFW or AWS Network Firewall) performs deep packet inspection at layers 3-7, and the return traffic must also be routed back through the inspection VPC to maintain stateful inspection, often requiring asymmetric routing handling. In a real-world scenario, this architecture is critical for compliance with PCI DSS or HIPAA, where all cross-account traffic must be logged and inspected.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Visual reference
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: Deploy a Transit Gateway and attach a central inspection VPC with a firewall appliance. Configure route tables to send inter-VPC traffic through the inspection VPC. — Option A is correct because a Transit Gateway with a central inspection VPC allows you to route all inter-VPC traffic through a firewall appliance for inspection. By configuring route tables on the Transit Gateway, you can force traffic between application VPCs to traverse the inspection VPC, enabling centralized security filtering without requiring point-to-point peering or per-VPC rules.
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: Jul 4, 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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