What is the primary function of AWS Transit Gateway?

The primary function of AWS Transit Gateway is to manage routing and simplify connectivity between different networks. This service enables you to connect multiple Virtual Private Clouds (VPCs) and on-premises networks through a central hub, effectively streamlining the processes of network management and routing.

With AWS Transit Gateway, you can reduce the complexity that comes with establishing point-to-point connections for each VPC. Instead of having to set up and maintain individual connections among VPCs or to on-premises environments, you can utilize the transit gateway to facilitate communication between all connected networks. This centralized approach simplifies overall network architecture, reduces latency, and improves performance. The transit gateway handles all routing between the connected networks, which means that it can scale efficiently as you grow the number of connected networks.

The other options touch on various AWS functionalities, but they do not describe the specific purpose of AWS Transit Gateway. Creating multiple VPCs pertains to the creation and management of virtual networks, not the routing capabilities. Serving as a backup for internet traffic flow suggests a different network function that is unrelated to the central management and routing capabilities of Transit Gateway. Monitoring health refers to AWS services like CloudWatch, which focuses on performance metrics rather than connectivity management.