AWS Certified Advanced Networking – Specialty (ANS-C01) — Question 260

A company has two teams: Team A and Team B. Team A has VPCs that run in Account A. The team uses a transit gateway (TGW-A) to route traffic between workloads that run in the different VPCs. Similarly, Team В has VPCs that run in Account B. Team В uses a different transit gateway (TGW-B) to route traffic between workloads that run in the different VPCs.

The company's network team manages the routing for Team A and Team В. The network team wants to retire TGW-B and use a single transit gateway to manage routing for the VPCs of both teams.

Which solution will meet this requirement with the LEAST operational overhead?

Answer options

• A. Create a resource share for TGW-A Share TGW-A with Account B. Create VPC attachments for the VPCs in Account В. Configure routing for the VPCs in TGW-A route tables. Update the route tables of the VPCs in Account В to forward traffic to TGW-Delete TGW-B attachments and TGW-B.
• B. Create a resource share for TGW-A. Share TGW-A with Account В. Replicate the TGW-B configuration to TGW-A to automatically start routing changes for the VPCs in Account В. Delete TGW-B when routing changes are complete.
• C. Create a new transit gateway (TGW-C) in Account A. Create a resource share for TGW-Share TGW-C with Account B. Create VPC attachments for the VPCs in Account A and Account В. Configure routing for all the VPCs in TGW-C route tables. Update the route tables for the VPCs in Account A and Account В to forward traffic to TGW-Delete TGW-A attachments and TGW-B attachments. Delete TGW-A and TGW-B.
• D. Create a new transit gateway (TGW-C) in a new account (Account C). Create a resource share for TGW-C. Share TGW-C with Account A and Account B. Create VPC attachments for the VPCs in Account A and Account В. Configure routing for all the VPCs in TGW-C route tables. Update the route tables for the VPCs in Account A and Account В to forward traffic to TGW-C. Delete TGW-A attachments and TGW-B attachments. Delete TGW-A and TGW-B.

Correct answer: A

Explanation

Option A is the least complex solution as it directly utilizes TGW-A for routing without needing to replicate configurations or create new gateways. Options B, C, and D involve additional steps such as replicating configurations or establishing new gateways, which adds unnecessary operational overhead.