Building a Scalable and Secure Multi-VPC AWS Network Infrastructure AWS Whitepaper. AGPIAL Audiobook Abstract AWS customers often rely on hundreds of accounts and VPCs to segment their workloads and expand their footprint. This level of scale often creates challenges around resource sharing, inter-VPC connectivity, and on-premises to VPC connectivity. This whitepaper describes best practices for creating scalable and secure network architectures in a large network using AWS services like Amazon VPC, AWS Transit Gateway, AWS PrivateLink, and AWS Direct Connect Gateway. It demonstrates solutions for managing growing infrastructure — ensuring scalability, high availability, and security while keeping overhead costs low.