A company has an AWS Direct Connect connection from its on-premises location to an AWS account. The AWS account contains 30 different VPCs in the same AWS Region. The VPCs use private virtual interfaces (VIFs). Each VPC has a CIDR block that does not overlap with other company-controlled networks. The company wants centralized network management while allowing each VPC to communicate with all other VPCs and on-premises networks. Which solution meets these requirements with the LEAST operational overhead?

The correct solution is to create a transit gateway, associate the Direct Connect connection with a new transit VIF, and enable the transit gateway's route propagation feature. A Transit Gateway acts as a central hub for network connectivity, allowing all 30 VPCs to communicate with each other and the on-premises network through a single connection. Using a transit VIF with Direct Connect simplifies connectivity to the Transit Gateway. Route propagation automatically updates routing tables, minimizing operational overhead. Creating a Direct Connect gateway and recreating private VIFs to use it, then associating each VPC with new virtual private gateways, is more complex and has higher operational overhead than a Transit Gateway for inter-VPC communication. Creating a transit VPC and peering connections between all other VPCs is an older pattern that involves managing many peering connections (N(N-1)/2 for N VPCs), which becomes unmanageable with 30 VPCs and has significant operational overhead. Creating AWS Site-to-Site VPN connections from on-premises to each VPC is not