Glossary

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subnet mask

A local bit mask (set of flags) that specifies which bits of the IP address specify a particular IP network or a host within a subnetwork. Used to "mask" a portion of an IP address so that TCP/IP can determine whether any given IP address is on a local or remote network. Each computer configured with TCP/IP must have a subnet mask defined.

A value that allows a network to be subdivided and provides for more complex address assignments. The subnet mask format is nnn.nnn.nnn.nnn, such as 255.255.255.0.

Used to subdivide an assigned network address into additional subnetworks by using some of the unassigned bits to designate local network addresses. Subnet masking facilitates routing by identifying the network of the local host. The subnet mask is a required configuration parameter for an IP host.

A local bit mask (set of flags) that specifies which bits of the IP address specify a particular IP network or a host within a subnetwork. Used to “mask" a portion of an IP address so that TCP/IP can determine whether any given IP address is on a local or remote network. Each computer configured with TCP/IP must have a subnet mask defined.

A 32-bit mask that identifies the portions of an IP address to be used for locating addresses in a subnetwork.