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

Glossary G-9
compression state Each file and folder on an NTFS volume has a compression state,
either compressed or uncompressed.
Computer Management A console that provides access to a number of management
utilities for administering a computer, including the ability to create, manage,
and monitor shared folders.
control set A Windows XP Professional installation contains control sets stored as
subkeys in the registry. The control sets contain configuration data used to control
the system, such as a list of which device drivers and services to load and start.
copy backup A backup type in which all selected files and folders are backed up,
regardless of their marker. During a copy backup, markers are not changed.
counter A particular aspect of an object that System Monitor can measure.
CPU See central processing unit (CPU).
D
database management system (DBMS) A layer of software between the physical
database and the user. The DBMS manages all requests for database action from
the user, including keeping track of the physical details of file locations and formats,
indexing schemes, and so on. In addition, a DBMS permits centralized control
of security and data integrity requirements.
data encryption See encryption.
Data Encryption Standard (DES) A commonly used, highly sophisticated algorithm
developed by the U.S. National Bureau of Standards for encrypting and decoding
data. This encryption algorithm uses a 56-bit key and maps a 64-bit input block to
a 64-bit output block. The key appears to be a 64-bit key, but one bit in each of
the 8 bytes is used for odd parity, resulting in 56 bits of usable key. See also
encryption.
data frames Logical, structured packages in which data can be placed. Data being
transmitted is segmented into small units and combined with control information
such as message start and message end indicators. Each package of information is
transmitted as a single unit, called a frame. The data-link layer packages raw bits
from the physical layer into data frames. The exact format of the frame used by the
network depends on the topology. See also frame.
data-link layer The second layer in the OSI reference model. This layer packages
raw bits from the physical layer into data frames. See also Open Systems Interconnection
(OSI) reference model.
data stream An undifferentiated, byte-by-byte flow of data.