ALSO CALLED: Internet Protocol Addresses, Internet Addresses, and IP Numbers DEFINITION: A subnet mask is a screen of numbers used for routing traffic within a subnet. Once a packet has arrived at an organization's gateway or connection point with its unique network number, it can be routed to its destination within the organization's internal gateways using the
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IP ADDRESSES DEFINITION (continued): … subnet number. The subnet mask consists of a screen of numbers indicating to the router which numbers it should look at underneath. In a binary mask, for example, a "1" over a number says "Look at the number underneath;" a "0" says "Don't look." Using a mask saves the router having to handle the entire 32 bit address; it can simply look at the bits selected by the mask.
Using the previous example (which is a very typical case), the combined network number and subnet … IP Addresses definition sponsored by SearchNetworking.com, powered by WhatIs.com an online computer dictionary
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