For IT leaders
VPC design decisions made early are expensive to undo; investing in clean address planning, segmentation, and connectivity patterns pays back for years.
Why IT teams care
Where this shows up at the team level
- VPC sprawl across teams produces duplicate IP ranges and connectivity headaches at scale.
- Security architecture (private subnets, NAT gateways, endpoints) is decided at the VPC layer.
- Hybrid connectivity to on-prem (Direct Connect, ExpressRoute, Cloud Interconnect) lives at the VPC edge.
In production
Where teams encounter it
- Each AWS region has VPCs; Azure uses VNets; Google Cloud uses VPC Networks
- Subnets, route tables, internet gateways, and NAT gateways inside each VPC
- VPC peering, Transit Gateway, or Cloud Hub for inter-VPC connectivity
How it works
How VPC actually works
- 01You assign a CIDR block to the VPC and split it into subnets across availability zones for resilience.
- 02Route tables determine how traffic flows: internet gateways for public traffic, NAT gateways for outbound from private subnets, and peering / transit for cross-VPC traffic.
- 03Security groups and network ACLs enforce filtering at the instance and subnet level.
- 04VPC endpoints keep traffic to managed services (S3, DynamoDB, etc.) private and avoid the public internet.
In practice
Common team use cases
- Hosting workloads on private subnets with controlled egress
- Building hub-and-spoke architectures with shared services VPCs
- Connecting cloud to on-prem via VPN or dedicated circuits
Build the capability
Related CBT Nuggets training
Each link routes to a hub that goes deeper than this definition.
Related concepts