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subnet
Last modified: Thursday, July 31, 2003 

A portion of a network that shares a common address component. On TCP/IP networks, subnets are defined as all devices whose IP addresses have the same prefix. For example, all devices with IP addresses that start with 100.100.100. would be part of the same subnet. Dividing a network into subnets is useful for both security and performance reasons. IP networks are divided using a subnet mask.

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Business Computing

Networks
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default gateway

IP address

subnet mask
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