VLSM — Variable Length Subnet Masking

VLSM lets one network carry subnet masks of different lengths, squeezing every address out of the space. Part of the CIDR concept; requires classless routing protocols (OSPF, EIGRP, RIPv2, IS-IS, BGP — not RIPv1/IGRP). Method List host requirements per subnet Sort largest → smallest Pick prefix per need (/26, /27, /30 for point-to-point, /32 for […]