ANS-C01 Network Implementation Practice Question
A company has a Direct Connect connection with a private virtual interface (VIF) attached to a Virtual Private Gateway (VGW) that is associated with a single VPC (10.0.0.0/16). The on-premises network uses BGP to exchange routes. The company has recently acquired another company and needs to connect to their VPC (172.16.0.0/16) in the same region. They want to use the existing Direct Connect connection to access both VPCs. The network engineer creates a Transit Gateway, attaches both VPCs, and creates a transit virtual interface (VIF) to the Transit Gateway. The engineer also deletes the private VIF. However, after the change, on-premises users cannot reach either VPC. What should the engineer do to restore 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
✓
Configure BGP on the on-premises router to peer with the Transit Gateway over the transit VIF.
When the private VIF was replaced with a transit VIF to the Transit Gateway, the on-premises router lost its BGP peering with the VGW. To restore connectivity, the on-premises router must be configured to establish BGP peering with the Transit Gateway over the transit VIF. This allows route exchange between on-premises and both VPCs attached to the Transit Gateway. Option A is correct. Option B is incorrect because attaching VPCs with different route tables is not the issue; the VPCs are already attached. Option C is incorrect because creating separate private VIFs would be unnecessary and defeats the purpose of using a Transit Gateway. Option D is incorrect because route propagation is already enabled by default when VPCs are attached to a Transit Gateway; the missing piece is the BGP session from on-premises.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure BGP on the on-premises router to peer with the Transit Gateway over the transit VIF.
Why this is correct
BGP must be configured for route exchange.
- ✗
Attach the VPCs to the Transit Gateway with different route tables.
Why it's wrong here
Attachment already done; route tables need proper configuration.
- ✗
Create a new private VIF to each VPC.
Why it's wrong here
Transit VIF can handle multiple VPCs; private VIFs are not needed.
- ✗
Enable route propagation on the Transit Gateway route tables.
Why it's wrong here
Route propagation is needed but the primary issue is BGP peering.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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