- A
Establish a VPN connection between the two VPCs and route traffic through the firewall.
Why wrong: VPN would work but does not provide the scalability and flexibility of Transit Gateway peering.
- B
Create a Transit Gateway in each region, peer them, and configure route tables to send inter-region traffic through the inspection VPC in us-east-1.
Transit Gateway peering enables cross-region connectivity, and route tables can steer traffic for inspection.
- C
Create a VPC peering connection between the two VPCs and update route tables.
Why wrong: VPC peering is not transitive and cannot be used with Transit Gateway for centralized inspection.
- D
Use a Direct Connect gateway to connect the two VPCs directly.
Why wrong: Direct Connect gateways are used for on-premises connections, not for inter-region VPC connections.
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 implementing a multi-region architecture with VPCs in us-east-1 and eu-west-1. They want to connect these VPCs using a Transit Gateway and ensure that traffic between regions can be inspected by a firewall in us-east-1. Which configuration is required?
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 Transit Gateway in each region, peer them, and configure route tables to send inter-region traffic through the inspection VPC in us-east-1.
Option B is correct because it uses Transit Gateway inter-region peering to connect the two regions, and by attaching an inspection VPC (with a firewall) in us-east-1 to the Transit Gateway, you can route all inter-region traffic through that VPC for inspection. The Transit Gateway route tables in each region are configured to send traffic destined for the other region to the inspection VPC attachment, ensuring traffic is inspected before being forwarded.
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.
- ✗
Establish a VPN connection between the two VPCs and route traffic through the firewall.
- ✓
Create a Transit Gateway in each region, peer them, and configure route tables to send inter-region traffic through the inspection VPC in us-east-1.
Why this is correct
Transit Gateway peering enables cross-region connectivity, and route tables can steer traffic for inspection.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a VPC peering connection between the two VPCs and update route tables.
Why it's wrong here
VPC peering is not transitive and cannot be used with Transit Gateway for centralized inspection.
- ✗
Use a Direct Connect gateway to connect the two VPCs directly.
Why it's wrong here
Direct Connect gateways are used for on-premises connections, not for inter-region VPC connections.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse VPC peering (which is non-transitive) with Transit Gateway peering (which supports transitive routing through inspection VPCs), leading them to select Option C incorrectly.
Detailed technical explanation
How to think about this question
Transit Gateway inter-region peering uses the AWS global network backbone to route traffic between regions with low latency and high bandwidth. The inspection VPC acts as a transit VPC, where a firewall (e.g., Palo Alto Networks or AWS Network Firewall) performs stateful inspection; route tables in the Transit Gateway must have a static route for the remote VPC CIDR pointing to the inspection VPC attachment, and the inspection VPC must have appropriate routing to forward traffic back to the Transit Gateway. This design is commonly used in multi-region architectures requiring centralized security compliance, such as for PCI DSS or HIPAA.
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
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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: Create a Transit Gateway in each region, peer them, and configure route tables to send inter-region traffic through the inspection VPC in us-east-1. — Option B is correct because it uses Transit Gateway inter-region peering to connect the two regions, and by attaching an inspection VPC (with a firewall) in us-east-1 to the Transit Gateway, you can route all inter-region traffic through that VPC for inspection. The Transit Gateway route tables in each region are configured to send traffic destined for the other region to the inspection VPC attachment, ensuring traffic is inspected before being forwarded.
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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