Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 474 discussion

The correct answer is: C. Use AWS Transit Gateway to manage VPC communication in a single Region and Transit Gateway peering across Regions to manage VPC communications. AWS Transit Gateway is a network hub that you can use to connect your VPCs and on-premises networks. It provides a single point of control for managing your network traffic, and it can help you to reduce the number of connections that you need to manage. Transit Gateway peering allows you to connect two Transit Gateways in different Regions. This can help you to create a global network that spans multiple Regions. To use Transit Gateway to manage VPC communication in a single Region, you would create a Transit Gateway in each Region. You would then attach your VPCs to the Transit Gateway. To use Transit Gateway peering to manage VPC communication across Regions, you would create a Transit Gateway peering connection between the Transit Gateways in each Region.

AWS Transit Gateway: Transit Gateway is a highly scalable service that simplifies network connectivity between VPCs and on-premises networks. By using a Transit Gateway in a single Region, you can centralize VPC communication management and reduce administrative effort. Transit Gateway Peering: Transit Gateway supports peering connections across AWS Regions, allowing you to establish connectivity between VPCs in different Regions without the need for complex VPC peering configurations. This simplifies the management of VPC communications across Regions.

C is like a managed solution for A. A can work but with a lot of overhead (CIDR blocks uniqueness requirement). B and D are not the right products

multiple regions + multiple VPCs --> Transit Gateway

Definitely C. Very well explained by @Felix_br

Ccccccccccccccccccccc if you have services in multiple Regions, a Transit Gateway will allow you to access those services with a simpler network configuration.