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AWS Certified Solutions Architect - Professional · AWS
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there are a lot of unknowns ( IS there AWS organization so we can use Ram to share TGW or if these VPC's are in the same region). If we think about sharing there are supposed be AWS organizations and RAM
With hundreds of VPCs you will inevitably face CIDR overlapping conflict so better to use Transit Gateway
There's a key information that is not mentioned in the question, if the VPCs are in the same region or in different regions, as we're talking of hundreds of AWS accounts the answer will be VPC peering as a single transit gateway doesn´t support different regions so A. If all VPCs are in the same region, the answer would be transit gateway so B. Saying that I go for A