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Whether a subnet is "public" or "private" is decided by routing, not by labels. Once we understand how Internet Gateway (IGW), NAT Gateway, route tables, and VPC endpoints combine, the meaning of subnet design becomes c…
A VPC (Virtual Private Cloud) is the virtual network where compute, databases, and load balancers live in AWS. If the shape of the VPC is not defined first, every decision inside it stays unstable.