What is VLSM? how to Calculate VLSM? where it is use and
why?

Answer Posted / gurminder

Variable Length Subnet Mask (VLSM) is a means of allocating
IP addressing resources to subnets according to their
individual need rather than some general network-wide rule.
Of the IP routing protocols supported by Cisco, OSPF, Dual
IS-IS, BGP-4, and EIGRP support "classless" or VLSM routes.

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