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Linux A version of Unix, developed by Linus Torvalds. Runs on Intel-based PCs and is generally free. See also Unix.

LIP See Large Internet Packet.

local area network (LAN) A network that is restricted to a single building, group of buildings, or even a single room. A LAN can have one or more servers.

local groups Groups created on individual servers. Rights can be assigned only to local resources.

local loop The part of the PSTN that goes from the central office to the demarcation point at the customer’s premises. See also central office, demarcation point, Public Switched Telephone Network.

log file A file that keeps a running list of all errors and notices, the time and date they occurred, and any other pertinent information.

logical bus topology Type of topology in which the signal travels the distance of the cable and is received by all stations on the backbone. See also backbone.

logical link control (LLC) A sublayer of the Data Link layer. Provides an interface between the MAC sublayer and the Network layer. See also media access control, topology.

logical network addressing The addressing scheme used by protocols at the Network layer.

logical parallel port Port used by the CAPTURE command to redirect a workstation printer port to a network print queue. The logical port has no relation to the port to which the printer is actually attached or to the physical port. See also physical parallel port.

logical port address A value that is used at the Transport layer to differentiate between the upper-layer services.

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