This is important, especially for the crowded public IP address space where it doesn't make sense to assign the complete IP address range for a network to an individual organization. Thus, rather than having networks with hundreds, thousands, or millions of nodes, you have a subnet that is sized appropriately for the number of nodes that you use. ![]() Subnetting is designed to make more efficient use of the IP address space. This ensures the subnet is isolated and doesn't affect other subnets. Typically, such networks are also physically separated by a router. Logically, it exists separately from other networks even if hosts on those other networks share the same network ID. ![]() A subnet is a portion of a network that operates as a separate network. Anyone that works with computers should learn about subnetting and what it means.
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