AWS › VPC & Networking
How should an organization design a scalable, secure VPC architecture that supports multiple accounts, hybrid connectivity, and future growth?
AdvancedAnswer
A scalable VPC architecture typically uses a hub and spoke model built around a Transit Gateway that centrally connects multiple VPCs across different accounts along with an on premises network through Direct Connect, carefully plans non overlapping IP address ranges across all VPCs to avoid future conflicts, separates workloads into distinct VPCs or subnets based on their security and compliance requirements, and centralizes shared services like DNS resolution and network monitoring, all designed with enough IP address space and architectural flexibility to accommodate significant future growth without requiring a disruptive redesign later.
aws ec2 create-transit-gateway-vpc-attachment --transit-gateway-id tgw-12345 --vpc-id vpc-12345 --subnet-ids subnet-12345Real-world example A rapidly growing company designs its VPC architecture around a central Transit Gateway from the very beginning, carefully allocating non overlapping IP address ranges across dozens of planned future VPCs, avoiding the painful re architecture that many organizations face when their initial simple networking design cannot accommodate later growth.