- A
Use VPC Peering for all inter-VPC communication
Why wrong: VPC Peering does not support transitive routing.
- B
Create a dedicated inspection VPC with a firewall appliance and attach it to the Transit Gateway. Use Transit Gateway route tables to route traffic from all VPCs through the inspection VPC.
Provides centralized inspection.
- C
Use AWS Site-to-Site VPN between each VPC and a central VPN hub
Why wrong: Site-to-Site VPN is for on-premises, not VPC-to-VPC.
- D
Create separate Transit Gateway route tables for production and development environments. For development VPCs, add a static route for 0.0.0.0/0 pointing to a NAT Gateway in a shared services VPC.
Provides internet access for development VPCs while isolating them.
- E
Use AWS Client VPN to connect development VPCs to the production VPC
Why wrong: Client VPN is for remote users, not VPC-to-VPC.
Quick Answer
The correct actions are to create separate Transit Gateway route tables for production and development environments and, for development VPCs, add a static route for 0.0.0.0/0 pointing to a NAT Gateway in a shared services VPC. This design achieves multi-account transit gateway isolation by segmenting traffic domains, while the static route enables centralized internet egress without allowing development VPCs to communicate with each other. For centralized inspection, a dedicated inspection VPC with a firewall appliance is attached to the Transit Gateway, and separate route tables force all inter-VPC traffic through that appliance, meeting the encryption in transit requirement for PCI DSS compliance by ensuring traffic passes through a controlled inspection point. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of Transit Gateway route table segmentation and how to enforce traffic flow for both isolation and inspection. A common trap is assuming a single route table can handle both isolation and centralized inspection; remember that separate route tables are the key to enforcing domain boundaries. Memory tip: “Separate tables for separate labels—inspect the middle, isolate the edges.”
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 designing a network architecture for a multi-account AWS environment using AWS Transit Gateway. They need to meet the following requirements: (1) Centralized inspection of traffic between VPCs using a firewall appliance. (2) Isolated development environments that cannot communicate with each other but can access the internet via a centralized NAT gateway. (3) Compliance with PCI DSS for production workloads, requiring encryption in transit between VPCs. Which TWO actions should they take?
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 dedicated inspection VPC with a firewall appliance and attach it to the Transit Gateway. Use Transit Gateway route tables to route traffic from all VPCs through the inspection VPC.
Option B is correct because it enables centralized traffic inspection by attaching a dedicated inspection VPC with a firewall appliance to the Transit Gateway and using separate route tables to force all inter-VPC traffic through that inspection VPC. This design meets the requirement for centralized inspection without requiring complex peering or VPN configurations.
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 VPC Peering for all inter-VPC communication
Why it's wrong here
VPC Peering does not support transitive routing.
- ✓
Create a dedicated inspection VPC with a firewall appliance and attach it to the Transit Gateway. Use Transit Gateway route tables to route traffic from all VPCs through the inspection VPC.
Why this is correct
Provides centralized inspection.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use AWS Site-to-Site VPN between each VPC and a central VPN hub
Why it's wrong here
Site-to-Site VPN is for on-premises, not VPC-to-VPC.
- ✓
Create separate Transit Gateway route tables for production and development environments. For development VPCs, add a static route for 0.0.0.0/0 pointing to a NAT Gateway in a shared services VPC.
Why this is correct
Provides internet access for development VPCs while isolating them.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use AWS Client VPN to connect development VPCs to the production VPC
Why it's wrong here
Client VPN is for remote users, not VPC-to-VPC.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume VPC Peering or VPNs are simpler solutions for multi-VPC connectivity, but they fail to recognize that Transit Gateway is specifically designed for transitive routing and centralized inspection at scale, and that separate route tables are essential for isolating development environments while sharing a common NAT gateway.
Detailed technical explanation
How to think about this question
Transit Gateway route tables allow you to control traffic flow by associating and propagating routes per attachment. For centralized inspection, you create a route table for the inspection VPC that has routes for all VPC CIDRs pointing to the firewall appliance, and separate route tables for other VPCs that point default routes (0.0.0.0/0) to the NAT Gateway in a shared services VPC while pointing inter-VPC traffic to the inspection VPC attachment. This design also supports PCI DSS encryption in transit by enabling AWS Transit Gateway inter-region peering with automatic encryption or by using VPN attachments with IPsec.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
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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 dedicated inspection VPC with a firewall appliance and attach it to the Transit Gateway. Use Transit Gateway route tables to route traffic from all VPCs through the inspection VPC. — Option B is correct because it enables centralized traffic inspection by attaching a dedicated inspection VPC with a firewall appliance to the Transit Gateway and using separate route tables to force all inter-VPC traffic through that inspection VPC. This design meets the requirement for centralized inspection without requiring complex peering or VPN configurations.
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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Same concept, more angles
1 more ways this is tested on ANS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is designing a multi-account architecture using AWS Transit Gateway. They need to isolate development and production environments but allow shared services account access to both. What is the most scalable and secure design?
medium- A.Use a single Transit Gateway and configure separate route tables for each environment, attaching VPCs from each account.
- B.Use a single Transit Gateway with one route table for all environments and implement security groups to isolate traffic.
- ✓ C.Create two Transit Gateways: one for development and one for production. Share the Transit Gateways with the shared services account via AWS Resource Access Manager.
- D.Use VPC Peering between each VPC and the shared services VPC, and set up Internet Gateway for each environment.
Why C: Option B is correct because separate Transit Gateways with resource sharing provide complete isolation. Option A is wrong because a single Transit Gateway with separate route tables still has a shared control plane. Option C is wrong because VPC Peering does not scale. Option D is wrong because a single Transit Gateway with centralized inspection does not isolate traffic.
Last reviewed: Jun 24, 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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