(also subnetwork, subnet mask)
A subnet (also known as a subnetwork) is a small network within a large one. Large networks are generally difficult to maintain. Furthermore, traffic must travel a longer distance and pass through unnecessary routers to reach its destination. Subnetting –– or dividing the network into smaller pieces –– is used to make the network easier to maintain. While it has many benefits, subnetting requires additional hardware (e.g., routers), potentially costing extra to implement.
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