AWS Certified Solutions Architect Professional SAP-C02 Practice Question

The correct approach is to leverage a cloud exchange provider to connect the existing AWS Direct Connect to an Azure ExpressRoute circuit. This solution creates a completely private, high-bandwidth, and low-latency path between AWS and Azure. By using a Direct Connect gateway associated with the Transit Gateway, the connectivity can be extended to all VPCs attached to the Transit Gateway, providing a scalable and centrally managed solution. A transit VIF on the Direct Connect gateway is the proper way to integrate with a Transit Gateway for scalable hybrid connectivity.

A Site-to-Site VPN, while encrypted, routes traffic over the public internet, which violates a key requirement and generally offers less predictable performance and latency compared to a dedicated connection like Direct Connect and ExpressRoute.

AWS PrivateLink and Azure Private Link are designed to provide private access to specific services within their respective clouds or from a customer's VPC to a partner's service endpoint within the same cloud platform. They cannot be used to establish a direct network bridge between an entire AWS VPC and an Azure VNet.

A public VIF on a Direct Connect connection is used to access public AWS service endpoints (like S3 or DynamoDB) without traversing the internet to reach the AWS network edge. However, traffic from AWS to Azure would still need to traverse the public internet, violating the core security requirement.