- A
Transit Gateway VPC attachments
Each VPC must be attached to the Transit Gateway to enable connectivity through the Transit Gateway.
- B
VPC peering connections between each VPC
Why wrong: VPC peering does not support transitive routing and would require many connections, not integrating with Direct Connect.
- C
AWS Site-to-Site VPN connection
Why wrong: A VPN connection is not necessary if using Direct Connect; it would add complexity and cost.
- D
AWS Direct Connect gateway
A Direct Connect gateway is used to associate a Direct Connect virtual interface with one or more Transit Gateways in the same or different accounts/regions.
- E
AWS Transit Gateway
Transit Gateway acts as a hub for connecting multiple VPCs and the Direct Connect virtual interface, enabling transitive routing.
Quick Answer
The answer is AWS Transit Gateway, an AWS Direct Connect gateway, and Transit Gateway VPC attachments. These three components work together because the Transit Gateway acts as a central hub for routing traffic between multiple VPCs, providing private IP connectivity, while the Direct Connect gateway allows a single Direct Connect connection from your on-premises data center to be associated with the Transit Gateway, enabling access to all attached VPCs without needing multiple virtual interfaces. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of how to scale hybrid connectivity efficiently, often appearing as a multi-select question where a common trap is choosing VPC peering instead of a Transit Gateway—remember that VPC peering does not support transitive routing and would require a full mesh. A useful memory tip is “TGV for transitive, DXG for single pipe,” reinforcing that the Transit Gateway provides transitive routing between VPCs while the Direct Connect gateway consolidates the on-premises link.
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 wants to connect its on-premises data center to AWS using AWS Direct Connect and wants to use the same connection to access multiple VPCs in the same AWS region. The company also needs to maintain private IP connectivity between the VPCs. Which THREE components should the company use to meet these requirements? (Choose three.)
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
Transit Gateway VPC attachments
Transit Gateway VPC attachments allow multiple VPCs to connect to a central transit gateway, enabling private IP connectivity between them. When combined with an AWS Direct Connect gateway, the on-premises data center can use a single Direct Connect connection to reach all attached VPCs via the transit gateway, meeting both requirements efficiently.
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.
- ✓
Transit Gateway VPC attachments
Why this is correct
Each VPC must be attached to the Transit Gateway to enable connectivity through the Transit Gateway.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
VPC peering connections between each VPC
Why it's wrong here
VPC peering does not support transitive routing and would require many connections, not integrating with Direct Connect.
- ✗
AWS Site-to-Site VPN connection
Why it's wrong here
A VPN connection is not necessary if using Direct Connect; it would add complexity and cost.
- ✓
AWS Direct Connect gateway
Why this is correct
A Direct Connect gateway is used to associate a Direct Connect virtual interface with one or more Transit Gateways in the same or different accounts/regions.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
AWS Transit Gateway
Why this is correct
Transit Gateway acts as a hub for connecting multiple VPCs and the Direct Connect virtual interface, enabling transitive routing.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse VPC peering with transit gateway, assuming peering can provide transitive routing or work with a single Direct Connect connection, but AWS explicitly requires a transit gateway for hub-and-spoke connectivity with Direct Connect.
Detailed technical explanation
How to think about this question
An AWS Transit Gateway acts as a hub-and-spoke router, using BGP to propagate routes between attached VPCs and the Direct Connect gateway. The Direct Connect gateway aggregates the private virtual interfaces (VIFs) from the Direct Connect connection and presents a single endpoint to the transit gateway, allowing the on-premises network to reach all VPCs with a single BGP session. This setup supports up to 3,000 VPC attachments per transit gateway and enables inter-VPC traffic without the need for explicit peering.
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
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: Transit Gateway VPC attachments — Transit Gateway VPC attachments allow multiple VPCs to connect to a central transit gateway, enabling private IP connectivity between them. When combined with an AWS Direct Connect gateway, the on-premises data center can use a single Direct Connect connection to reach all attached VPCs via the transit gateway, meeting both requirements efficiently.
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 24, 2026
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