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130 Glossary
IP (Internet Protocol) Also known as IPv4. A method used with Transmission Control
Protocol (TCP) to send data between computers over a local network or the Internet. IP
delivers packets of data, while TCP keeps track of data packets.
IP address A unique numeric address that identifies a computer on the Internet.
IP subnet A portion of an IP network, which may be a physically independent network
segment, that shares a network address with other portions of the network and is
identified by a subnet number.
ISP (Internet service provider) A business that sells Internet access and often provides
web hosting for ecommerce applications as well as mail services.
JBoss A full-featured Java application server that provides support for Java 2 Platform,
Enterprise Edition (J2EE) applications.
Kerberos A secure network authentication system. Kerberos uses tickets, which are
issued for a specific user, service, and period of time. Once a user is authenticated, it is
possible to access additional services without retyping a password (this is called single-
signon) for services that have been configured to take Kerberos tickets. Mac OS X
Server uses Kerberos v5.
LAN (local area network) A network maintained within a facility, as opposed to a WAN
(wide area network) that links geographically separated facilities.
LDAP (Lightweight Directory Access Protocol) A standard client-server protocol for
accessing a directory domain.
lease period A limited period of time during which IP addresses are assigned. By using
short leases, DHCP can reassign IP addresses on networks that have more computers
than available IP addresses.
load balancing The process of distributing the demands by client computers for
network services across multiple servers in order to optimize performance by fully
utilizing the capacity of all available servers.
local domain A directory domain that can be accessed only by the computer on which
it resides.
local home directory A home directory that resides on disk on the computer a user is
logged in to. It is accessible only by logging directly in to the computer where it resides
unless you log in to the computer using SSH.
long name See user name.
LPR (Line Printer Remote) A standard protocol for printing over TCP/IP.
mail host The computer that provides your mail service.
LL2343.Book Page 130 Thursday, August 14, 2003 5:12 PM