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AWS Solutions Architect Associate (SAA-C03) · Free practice question 3 of 12

Transit Gateway instead of peering mesh

Marston Group has 25 VPCs in one Region and has connected them with a growing mesh of VPC peering connections. Engineers are frustrated that traffic does not pass from one VPC through a peered VPC to a third VPC, and the number of peering connections is becoming hard to manage. Which solution simplifies connectivity for all VPCs?

  1. A.Attach all VPCs to an AWS Transit Gateway and use its route tables to control routing
  2. B.Add more peering connections so every VPC is peered with every other VPC and route through a central VPC
  3. C.Create a VPN connection between each pair of VPCs
  4. D.Enable transitive routing on the existing peering connections
Show answer and explanation

Correct answer: A. Attach all VPCs to an AWS Transit Gateway and use its route tables to control routing

Why: A Transit Gateway acts as a regional hub that VPCs attach to once, and its route tables control which attachments can reach each other, replacing a complex peering mesh. VPC peering is non-transitive and has no setting to make it transitive, a full mesh grows quadratically, and per-pair VPNs add even more overhead.

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