What does VLSM stand for?

VLSM stands for Variable Length Subnet Mask. This networking technique allows for more efficient use of IP address space by enabling different subnets in the same network to have varying subnet masks. As a result, subnets can be sized according to the specific number of hosts needed, leading to better management of address allocation and reduced wastage of IP addresses. This is particularly useful when dealing with networks that have significantly different sizes of segments, as it allows for optimization rather than forcing all subnets to conform to a single, fixed mask.

The concept behind VLSM is critical for network design, especially in larger, hierarchical networks where efficient routing and address management are necessary for scalability and performance. By allowing variable lengths, it provides the flexibility to adjust subnet sizes as a network grows or changes, which is a significant advantage in IP address management.