A company has 50 VPCs across multiple AWS accounts. They need to establish network connectivity between all VPCs and their on-premises data center via a single AWS Direct Connect connection. What is the MOST scalable and high-performing architecture?

Answer options:

Create VPC peering connections between all 50 VPCs.

Use AWS Transit Gateway to connect the VPCs and the Direct Connect connection.

Deploy a software VPN appliance on an EC2 instance in a central VPC.

Connect each VPC directly to the Direct Connect connection using Private VIFs.

How to approach this question

Look for 'many VPCs' and 'scalable connectivity'. Transit Gateway is the hub-and-spoke solution.

Full Answer

B.Use AWS Transit Gateway to connect the VPCs and the Direct Connect connection.✓ Correct

AWS Transit Gateway connects VPCs and on-premises networks through a central hub. This simplifies your network and puts an end to complex peering relationships. It acts as a highly scalable cloud router.

Common mistakes

Choosing VPC Peering, which becomes unmanageable at scale due to the lack of transitive routing.

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Practice the full AWS SAA-C03 Practice Exam 3

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