VLSM

VLSM, or Variable Length Subnet Masking, is a technique that allows a network to be divided into subnets of different sizes by using different subnet masks within the same network. Unlike fixed-length subnetting, where all subnets are the same size, VLSM lets you allocate address space more efficiently based on the actual needs of each subnet. This is especially useful for conserving IP addresses in complex network designs with varying host requirements.