ANS-C01 Network Design Practice Question
A company has a Direct Connect connection with a private VIF attached to a Direct Connect Gateway. The company wants to connect to multiple VPCs in the same AWS Region. What is the MOST cost-effective and scalable design?
⚠ Common exam trap
AWS often tests the misconception that a Direct Connect Gateway alone can provide transitive routing between VPCs, but in reality, a Direct Connect Gateway only connects VPCs to on-premises networks, not VPCs to each other, which is why a Transit Gateway is needed for inter-VPC connectivity.
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, attach it to the Direct Connect Gateway using a Transit VIF, and attach each VPC to the Transit Gateway.
It uses a Transit Gateway (TGW) to interconnect multiple VPCs and a Direct Connect Gateway (DXGW) via a Transit VIF, which is the most cost-effective and scalable design. The Transit VIF allows a single Direct Connect connection to be shared across many VPCs through the TGW, avoiding the need for multiple private VIFs or complex peering arrangements. This design scales to hundreds of VPCs and reduces operational overhead by centralizing routing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Provision multiple private VIFs, each connected to a different VPC.
Why it's wrong here
Multiple VIFs increase cost and complexity.
- ✗
Create a Direct Connect Gateway and associate each VPC's Virtual Private Gateway to it using a private VIF.
Why it's wrong here
A private VIF can only be associated with one Direct Connect Gateway; multiple VPCs require a Transit VIF.
- ✓
Create a Transit Gateway, attach it to the Direct Connect Gateway using a Transit VIF, and attach each VPC to the Transit Gateway.
Why this is correct
This is scalable and cost-effective.
- ✗
Use a private VIF to connect to a Virtual Private Gateway in one VPC and use VPC Peering to reach other VPCs.
Why it's wrong here
VPC Peering is not transitive and requires many connections.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.