Subnetting is the practice of dividing a network into two or more smaller networks. It increases routing efficiency, enhances the security of the network and reduces the size of the broadcast domain. 1. Fixed-Length Subnet Masking: Introduction: A fixed-length subnet mask ( FLSM ) is a sequence of numbers of unchanging length that streamlines packet routing within the subnets of a proprietary network. Addressing: FLSM Static Routing: 2.Variable-Length Subnet Masking: Intoduction: Variable-Length Subnet Masking (VLSM) amounts to "subnetting subnets ," which means that VLSM allows network engineers to divide an IP address space into a hierarchy of subnets of different sizes, making it possible to create subnets with very different host counts without wasting large numbers of addresses Addressing: VLSM Static Routing:
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