A local area network (LAN) is a group of computers and associated devices that share a common communications line and typically share the resources of a single processor or server within a small geographic area

In a network, latency is an expression of how much time it takes for a packet of data to get from one designated point to another.
In general, the period of time that one component in a system is spinning its wheels waiting for another component.

LDAP (Lightweight Directory Access Protocol) is a software protocol for enabling anyone to locate organizations, individuals, and other resources such as files and devices in a network. LDAP supports TCP/IP, which is necessary for any type of Internet access

Although not yet widely implemented, LDAP should eventually make it possible for almost any application running on virtually any computer platform to obtain directory information, such as email addresses and public keys. Because LDAP is an open protocol, applications need not worry about the type of server hosting the directory.

Leased line is a permanent telephone connection between two points provided by a Internet service provider. Typically, leased lines are used by businesses to connect geographically distant offices. Unlike normal dial-up connections, a leased line is always active. The fee for the connection is a fixed monthly rate. The primary factors affecting the monthly fee are distance between end points and the speed of the circuit.

Linux is a freely-distributable open source implementation of UNIX that runs on a number of hardware platforms, including Intel and Motorola microprocessors. Because it's free, and because it runs on many platforms, including PCs, Macintoshes and Amigas, Linux has become extremely popular over the last couple years. It was developed mainly by Linus Torvalds and pronounced like "lee-nucks". Another popular, free version of UNIX that runs on Intel microprocessors is FreeBSD.