ANS-C01 Network Design Practice Question
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?
⚠ Common exam trap
Many exam-takers 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.
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 Direct Connect gateway, associate the existing VIFs, and attach the Direct Connect gateway to the Transit Gateway.
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.
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.
Why it's wrong here
VPN is an alternative, not a direct integration.
- ✗
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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