ANS-C01 Transit Gateway route table Practice Question
A company uses AWS Transit Gateway to interconnect multiple VPCs and on-premises networks. They notice that traffic between two VPCs is taking a suboptimal path through the on-premises network instead of staying within AWS. What configuration change should be made to ensure optimal routing?
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
✓
Enable route propagation from the VPC attachments into the Transit Gateway route table.
Transit Gateway route tables control the path; enabling route propagation from VPC attachments will add routes for direct VPC-to-VPC communication. Option B is incorrect because cross-zone load balancing is a feature of load balancers, not Transit Gateway routing. Option C is incorrect because adding static routes to the VPN attachment would force traffic through the VPN, which is suboptimal. Option D is incorrect because modifying VPC route tables to point to the Transit Gateway is necessary for VPCs to send traffic to the Transit Gateway, but it does not control the Transit Gateway's internal path selection; the issue is about the Transit Gateway route table, not VPC route tables.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable route propagation from the VPC attachments into the Transit Gateway route table.
Why this is correct
Route propagation allows VPC routes to be exchanged, enabling direct routing.
- ✗
Disable cross-zone load balancing on the Transit Gateway.
Why it's wrong here
Cross-zone load balancing is for load balancers, not routing.
- ✗
Add static routes to the Transit Gateway route table pointing to the VPN attachment.
Why it's wrong here
That would force traffic to on-premises, making it worse.
- ✗
Modify the VPC route tables to add routes to the other VPC via the Transit Gateway.
Why it's wrong here
VPN attachments do not affect VPC-to-VPC routing.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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