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258 Glossary
computer account A computer account stores data that allows Mac OS X Server to
identify and manage an individual computer. You create a computer account for each
computer that you intend to add to a computer group. See also computer group.
computer group A set of computers and computer groups, which all receive the
managed preference settings defined for the group. New in Mac OS X Server version
10.5. See also computer list.
computer list A set of computers that all receive the managed preference settings
defined for the list, and that are all available to a particular set of users and groups. A
computer can be a member of only one computer list. Computer lists are created in
Mac OS X Server version 10.4 or earlier. See also computer group.
DHCP Dynamic Host Configuration Protocol. A protocol used to dynamically distribute
IP addresses to client computers. Each time a client computer starts up, the protocol
looks for a DHCP server and then requests an IP address from the DHCP server it finds.
The DHCP server checks for an available IP address and sends it to the client computer
along with a lease period—the length of time the client computer may use the
address.
directory domain A specialized database that stores authoritative information about
users and network resources; the information is needed by system software and
applications. The database is optimized to handle many requests for information and to
find and retrieve information quickly. Also called a directory node or simply a directory.
directory domain hierarchy A way of organizing local and shared directory domains. A
hierarchy has an inverted tree structure, with a root domain at the top and local
domains at the bottom.
directory node See directory domain.
directory services Services that provide system software and applications with
uniform access to directory domains and other sources of information about users and
resources.
disc Optical storage media, such as a CD or DVD.
disk A rewritable data storage device. See also disk drive, logical disk.
disk drive A device that contains a disk and reads and writes data to the disk.
disk image A file that, when opened, creates an icon on a Mac OS X desktop that looks
and acts like an actual disk or volume. Using NetBoot, client computers can start up
over the network from a server-based disk image that contains system software. Disk
image files have a filename extension of either .img or .dmg. The two image formats
are similar and are represented with the same icon in the Finder. The .dmg format
cannot be used on computers running Mac OS 9.