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MCSA/MCSE Self-Paced Training Kit (Exam 70-270): Installing ...

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G-6 Glossary<br />

baud rate Refers to the speed at which a modem can transmit data. Often confused<br />

with bps (the number of bits per second transmitted), baud rate actually measures<br />

the number of events, or signal changes, that occur in one second. Because one<br />

event can actually encode more than one bit in high-speed digital communication,<br />

baud rate and bps are not always synonymous, and the latter is the more accurate<br />

term to apply to modems. For example, the 9600-baud modem that encodes four<br />

bits per event actually operates at 2400 baud but transmits at 9600 bps (2400<br />

events times 4 bits per event), so it should be called a 9600-bps modem. See also<br />

bits per second (bps).<br />

bind To associate two pieces of information with one another.<br />

binding A process that establishes the communication channel between network<br />

components on different levels to enable communication between those components—for<br />

example, the binding of a protocol driver (such as TCP/IP) and a network<br />

adapter.<br />

BIOS See basic input/output system (BIOS).<br />

bisync (binary synchronous communications protocol) A communications<br />

protocol developed by IBM. Bisync transmissions are encoded in either ASCII or<br />

EBCDIC. Messages can be of any length and are sent in units called frames,<br />

optionally preceded by a message header. Because bisync uses synchronous<br />

transmission, in which message elements are separated by a specific time interval,<br />

each frame is preceded and followed by special characters that enable the sending<br />

and receiving machines to synchronize their clocks.<br />

bit Short for binary digit: either 1 or 0 in the binary number system. In processing and<br />

storage, a bit is the smallest unit of information handled by a computer. It is represented<br />

physically by an element such as a single pulse sent through a circuit or<br />

small spot on a magnetic disk capable of storing either a 1 or 0. Eight bits make a<br />

byte.<br />

bits per second (bps) A measure of the speed at which a device can transfer data.<br />

See also baud rate.<br />

bit time The time it takes for each station to receive and store a bit.<br />

bootable CD An automated installation method that runs Setup from a CD-ROM.<br />

This method is useful for computers at remote sites with slow links and no local<br />

IT department.<br />

BOOT.INI A file used to build the operating system choices that are displayed during<br />

startup.<br />

boot partition The disk partition that possesses the system files required to load the<br />

operating system into memory.

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