The Scaling Problem
In the beginning, you have one VPC. Networking is easy. You set up a few subnets, a route table, an Internet Gateway, and you're done.
Then your company grows.
- You acquire another company and need to connect their AWS accounts.
- You split your monolith into microservices across different VPCs.
- You need private access to S3 without going over the public internet.
- Users in Australia complain your app hosted in Virginia is slow.
Suddenly, the simple networking tools aren't enough. Managing dozens of individual point-to-point connections becomes a nightmare. Security becomes harder to enforce. Costs balloon because traffic takes inefficient paths.
This topic covers the professional-grade tools AWS provides to solve these scaling, security, and performance challenges: Transit Gateway, PrivateLink, VPC Flow Logs, and global acceleration services. Each tool targets a specific failure mode of naive networking at scale.