Operating instructions

dedicated telephone line A telephone line on a circuit that is always open, or
connected. Dedicated telephone lines usually are not assigned numbers.
default A software function or operation which occurs automatically unless
the user specifies something else.
default gateway In a TCP/IP network, the nearest router to a particular host.
This router’s IP address is part of the necessary TCP/IP configuration for com
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municating with multiple networks using IP.
defragmentation (DEFRAG) A procedure in which all the files on a hard disk
are rewritten on disk so that all parts of each file reside in contiguous clusters.
The result is an improvement of up to 75 percent of the disk’s speed during
retrieval operations.
degauss The procedure used to break up the electromagnetic fields that can
build up on the cathode ray tube of a monitor; involves running a current
through a wire loop. Most monitors feature a manual degaussing tool.
desktop A user’s primary interface to the Windows operating system.
desktop extenders A type of portable computer that offers some of the fea-
tures of a full-fledged desktop computer, but with a much smaller footprint and
lower weight.
desktop replacement A type of portable computer that offers the same per
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formance of a full-fledged desktop computer; these systems are normally very
heavy to carry and often cost much more than the desktop systems they replace.
DETLOG.TXT A log file created during the initial operating system installation
that tracks the detection, query, and installation of all devices.
device driver A program used by the operating system to control communi
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cations between the computer and peripherals.
Device Manager A utility that allows techs to examine and configure all the
hardware and drivers in a Windows PC.
DHCP (dynamic host configuration protocol) A protocol that enables a DHCP
server to set TCP/IP settings automatically for a DHCP client.
Passport / Mike Meyers‘ A+ Certification Passport / Meyers / 226308-3 / Glossary
20 MIKE MEYERS’ A+ CERTIFICATION PASSPORT
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