VLSM (Variable Length Subnet Masking) lets you use different mask sizes within the same network. Without VLSM, all subnets must be equal. A point-to-point link needs only addresses, but a wastes . With VLSM, you assign for links and for LANs. VLSM requires a routing protocol that carries mask information, like OSPF or EIGRP.
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
$ curl repovive.com/roadmaps/network-design/ip-addressing-and-subnetting/what-is-vlsm
░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░█████████████████████████████████████████████████████████████████████████████████████