- A
Create a single Transit Gateway that spans both Regions and attach VPCs in both Regions.
Why wrong: A Transit Gateway is regional and cannot span multiple Regions.
- B
Use VPC peering between the VPCs and route Direct Connect traffic through the VPC peering connection.
Why wrong: VPC peering does not support transitive routing and does not integrate with Direct Connect gateway.
- C
Create a Transit Gateway peering attachment between the Transit Gateways in us-east-1 and eu-west-1, and route traffic over the Direct Connect gateway via the peering.
Transit Gateway peering enables inter-Region connectivity. The Direct Connect gateway remains associated with the Transit Gateway in us-east-1, and routes can be propagated to allow traffic to flow across the peering.
- D
Associate the Direct Connect gateway with both Transit Gateways in us-east-1 and eu-west-1.
Why wrong: A Direct Connect gateway can be associated with only one Transit Gateway per Region, and cross-Region association is not supported.
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 designing a multi-Region architecture using AWS Transit Gateway and Direct Connect. They have VPCs in us-east-1 and eu-west-1, each with an attached Transit Gateway. The Direct Connect gateway is associated with the Transit Gateway in us-east-1. They need to enable communication between VPCs across Regions using the Direct Connect gateway. What is the correct design to achieve this?
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 peering attachment between the Transit Gateways in us-east-1 and eu-west-1, and route traffic over the Direct Connect gateway via the peering.
Option C is correct because Transit Gateway peering attachments allow transitive routing between Transit Gateways in different AWS Regions. By establishing a peering attachment between the Transit Gateways in us-east-1 and eu-west-1, traffic from the VPC in eu-west-1 can be routed through its local Transit Gateway, across the peering attachment to the Transit Gateway in us-east-1, and then over the Direct Connect gateway to on-premises networks. This design enables cross-region VPC communication via Direct Connect without requiring a single Transit Gateway or direct VPC peering.
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.
- ✗
Create a single Transit Gateway that spans both Regions and attach VPCs in both Regions.
Why it's wrong here
A Transit Gateway is regional and cannot span multiple Regions.
- ✗
Use VPC peering between the VPCs and route Direct Connect traffic through the VPC peering connection.
Why it's wrong here
VPC peering does not support transitive routing and does not integrate with Direct Connect gateway.
- ✓
Create a Transit Gateway peering attachment between the Transit Gateways in us-east-1 and eu-west-1, and route traffic over the Direct Connect gateway via the peering.
Why this is correct
Transit Gateway peering enables inter-Region connectivity. The Direct Connect gateway remains associated with the Transit Gateway in us-east-1, and routes can be propagated to allow traffic to flow across the peering.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Associate the Direct Connect gateway with both Transit Gateways in us-east-1 and eu-west-1.
Why it's wrong here
A Direct Connect gateway can be associated with only one Transit Gateway per Region, and cross-Region association is not supported.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a Direct Connect gateway can be associated with multiple Transit Gateways across regions, but AWS only supports a one-to-one association between a Direct Connect gateway and a Transit Gateway at a time, requiring Transit Gateway peering for cross-region connectivity.
Detailed technical explanation
How to think about this question
Transit Gateway peering attachments use the AWS global network to route traffic between Transit Gateways in different regions, leveraging the AWS backbone for low-latency, encrypted transit. The Direct Connect gateway acts as a hub for on-premises connectivity, and when associated with a Transit Gateway, it enables BGP-based route exchange between on-premises networks and the Transit Gateway. In this design, the Transit Gateway peering attachment must have static routes or propagate routes from the Direct Connect gateway to ensure reachability across regions, and careful route table configuration is required to avoid blackholing traffic.
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 Transit Gateway peering attachment between the Transit Gateways in us-east-1 and eu-west-1, and route traffic over the Direct Connect gateway via the peering. — Option C is correct because Transit Gateway peering attachments allow transitive routing between Transit Gateways in different AWS Regions. By establishing a peering attachment between the Transit Gateways in us-east-1 and eu-west-1, traffic from the VPC in eu-west-1 can be routed through its local Transit Gateway, across the peering attachment to the Transit Gateway in us-east-1, and then over the Direct Connect gateway to on-premises networks. This design enables cross-region VPC communication via Direct Connect without requiring a single Transit Gateway or direct VPC peering.
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: Jun 11, 2026
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