cloud-engineering
Subnet
Virtual Private Cloud Subnet
Definition
A subnet is a segment of a VPC's IP address range defined by a CIDR block that resources are launched into. Public subnets have routes to an internet gateway for inbound/outbound internet access; private subnets use a NAT gateway for outbound-only access.
Subnets span a single availability zone, so multi-AZ architectures require one subnet per AZ per tier (web, app, database).
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