Term Kind Topic What it is
CIDR Planning practice VPC Design Allocating non-overlapping address ranges across an estate in advance, because ranges cannot be resized and overlaps prevent connectivity.
VPC Design practice VPC Design How virtual networks, subnets and connectivity are structured — decisions that are cheap now and extremely expensive to change later.
VPC Peering concept VPC Design A direct network connection between two VPCs, which is simple, cheap and non-transitive — the last property being the one that shapes topology.