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LAN (Local Area Network)
LAN is a network connecting computers in a relatively small area such as a building. SO, LAN is a data communications
system netwrok confined to a limited geographic area (up to 6 miles or about 9.6 kilometers) with moderate to high
data rates (100 kbps to 1000 Mbps). The area served may consist of a single building, a cluster of buildings, or
a campus-type arrangement. The network uses some type of switching technology and does not use common carrier circuits
(although it may have gateways or bridges to other public or private networks). LAN allows any connected device
to interact with any other on the network.
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LATA (Local Access and Transport Area)
U.S. geographical subdivision that defines local (instead of long-distance) telephone service.
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Leased Line
Telephone line reserved for the exclusive use of leasing customers without interexchange switching arrangements.
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Linear Bus
Linear Bus is a network topology in which each node attaches directly to a common cable.
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Line break
A special character that forces a new line on a page without creating a new paragraph.
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Line Driver
A DCE device that amplifies a data signal for transmission over cable for distances beyond the RS-232 limit of
50 feet, even up to several miles. Also called "limited-distance modem" (LDM) or "short-haul modem"
(SHM).
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Link
1. Link is a communications circuit or transmission path connecting two points.
2. A link is text or a graphic that has been formatted to include the location of a document or graphic. When a
user clicks a link, the new document or graphic displays.
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LLC (Logical Link Control)
Maintains the Link between two computers by establishing SAPs which are a series of interface points. IEEE 802.2.
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Local
Local refers to something that is on your computer, as opposed to being on a server.
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Local site
Local site refers to the collection of Web files that are located on your computer, as opposed to being on a Web
server.
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LocalTalk
LocalTalk is Apple Corporation proprietary protocol that uses CSMA/CA media access scheme and supports transmissions
at speeds of 230 Kbps (Kilobits per second).
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Logical disk organization
Logical disk organization is a system how the operating system organizes the data stored on a disk. Because the
data can be anywhere on the surface of the disk, the operating system must construct a bookkeeping system that
allows it to keep track of where the data is. The operating system constructs directories and indexes describing
what's occupied, what's free, and what parts should never be used due to physical damage. This type of disk information
is called the logical format. The file allocation table used to organize the FAT file system and the master file
table used to organize the NTFS file system are part of the logical disk organization. Compare to physical disk
organization.
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Logic operator
An instruction in a program in which the quantity being operated on and the result of the operation each can have
one of two values. Logic operators include AND, OR, NAND, EXCLUSIVE OR, and NOR.
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Loopback
A diagnostic test in which the transmitted signal is returned to the sending device after passing through all or
part of a data communications link or network. A loopback test compares the returned signal with the transmitted
signal.
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Lost clusters / Lost Cluster Chain
Lost clusters are units of disk space that the FAT (File Allocation Table) indicates are in use, yet are not accounted
for by any directory entries on the disk. Usually these clusters represent garbage on the disk left over from when
programs stop unexpectedly. On rare occasions, however, lost clusters may contain valuable data. Lost Cluster Chain
is a cluster on disk that is not registered as free, but does not have any known data in it.
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LPT1
In a PC, the logical name assigned to parallel port #1.
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