A company wants to use AWS Direct Connect to connect the company's on-premises networks to the AWS Cloud. The company runs several VPCs in a single…

AWS Transit Gateway acts as a network transit hub, or a cloud router, to simplify network architecture and scale connectivity. By connecting all VPCs and the on-premises network (via a Direct Connect gateway) to a single Transit Gateway, the company can manage routing in one central place. This hub-and-spoke model eliminates the need for complex VPC peering meshes or managing numerous individual connections as the number of VPCs grows to the hundreds. It directly addresses the requirements to simplify and scale the network infrastructure.

A. VPC endpoints provide private connectivity from a VPC to AWS services, not for interconnecting multiple VPCs and on-premises networks.

C. Amazon Route 53 is a DNS service used for domain name resolution; it does not manage network routing topology or connectivity between VPCs.

D. AWS Secrets Manager is a service for managing credentials and secrets; it is entirely unrelated to network architecture or connectivity.

1. AWS Documentation: What is a transit gateway?

"An AWS Transit Gateway is a network transit hub that you can use to interconnect your virtual private clouds (VPCs) and on-premises networks... As your network grows

the complexity of managing incremental connections can be costly and cumbersome. With a transit gateway

you only have to create and manage a single connection from the central gateway into each VPC

on-premises data center

or remote office across your network."

Source: AWS Documentation

AWS Transit Gateway User Guide

"What is a transit gateway?".

2. AWS Documentation: How transit gateways work

"This simplifies management and reduces operational costs because each network only has to connect to the transit gateway and not to every other network." This section also includes a diagram illustrating the hub-and-spoke model.

Source: AWS Documentation

AWS Transit Gateway User Guide

"How transit gateways work".

3. AWS Documentation: Direct Connect gateways

"You can associate a transit gateway with a Direct Connect gateway. After you create this association

you can attach your VPCs to the transit gateway." This confirms the integration required by the scenario.

Source: AWS Documentation

AWS Direct Connect User Guide

"Working with Direct Connect gateways"

section "Direct Connect gateways".

4. AWS Whitepaper: Building a Scalable and Secure Multi-VPC AWS Network Infrastructure

This whitepaper discusses various network topologies and recommends AWS Transit Gateway as the solution for managing connectivity at scale. It states

"AWS Transit Gateway enables customers to connect thousands of VPCs."

Source: AWS Whitepapers & Guides

"Building a Scalable and Secure Multi-VPC AWS Network Infrastructure"

Page 13.