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 has a Direct Connect connection with two private virtual interfaces (VIFs) to two different VPCs in the same AWS Region. The company wants to use AWS Transit Gateway to simplify connectivity between these VPCs and their on-premises network. Which steps are required to integrate the existing Direct Connect connection with Transit Gateway?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a Direct Connect gateway, associate the existing VIFs, and attach the Direct Connect gateway to the Transit Gateway.
Option D is correct because AWS Direct Connect private VIFs cannot be attached directly to a Transit Gateway. Instead, you must create a Direct Connect Gateway, associate the existing private VIFs with it, and then attach the Direct Connect Gateway to the Transit Gateway. This architecture allows the Transit Gateway to route traffic between the on-premises network (via the Direct Connect connection) and the attached VPCs, while also enabling inter-VPC routing through the Transit Gateway.
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.
✗
Set up a VPN connection over the Direct Connect link and attach the VPN to the Transit Gateway.
Attach the existing private VIFs directly to the Transit Gateway.
Why it's wrong here
VIFs cannot attach directly to Transit Gateway; a Direct Connect gateway is needed.
✗
Create a new private VIF on the Direct Connect connection and attach it to the Transit Gateway.
Why it's wrong here
New VIFs are not necessary; existing VIFs can be associated with a Direct Connect gateway.
✓
Create a Direct Connect gateway, associate the existing VIFs, and attach the Direct Connect gateway to the Transit Gateway.
Why this is correct
This is the correct integration path.
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 assume private VIFs can be attached directly to a Transit Gateway, similar to how they attach to VPCs, but AWS requires the intermediate Direct Connect Gateway to mediate between the Layer 2 VIF and the Layer 3 Transit Gateway routing domain.
Detailed technical explanation
How to think about this question
The Direct Connect Gateway acts as a regional or global intermediary that terminates the private VIFs and presents a single attachment point to the Transit Gateway. This allows the Transit Gateway to propagate routes from the on-premises network (via BGP over the VIFs) to all attached VPCs, and vice versa. In multi-account or multi-region scenarios, a Direct Connect Gateway can be shared across accounts using AWS Resource Access Manager, enabling centralized connectivity without duplicating physical connections.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 Direct Connect gateway, associate the existing VIFs, and attach the Direct Connect gateway to the Transit Gateway. — Option D is correct because AWS Direct Connect private VIFs cannot be attached directly to a Transit Gateway. Instead, you must create a Direct Connect Gateway, associate the existing private VIFs with it, and then attach the Direct Connect Gateway to the Transit Gateway. This architecture allows the Transit Gateway to route traffic between the on-premises network (via the Direct Connect connection) and the attached VPCs, while also enabling inter-VPC routing through the Transit Gateway.
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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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.
Question Discussion
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