L
LACNIC - Latin America and Caribbean Network Information Center (regional Internet registry with overall management of public IP addresses for the Latin American region)
LAN - local area network (a computer network confined to a relatively small geographical area, such as a building or campus)
LDAP - Lightweight Directory Access Protocol (industry-standard protocol which allows users to access, retrieve, and modify information in a directory)
LEAP - Lightweight Extensible Authentication Protocol (a proprietary protocol developed by CISCO for use in wireless LAN devices for authentication)
LIFO - last in, first out (a programming procedure in which the last piece of data, or programming instruction, added to a memory stack, is the first piece of data taken off)
LIR - Local Internet Registry (registry with overall management of public IP addresses for a particular region within a country)
LISA - Large Installation System Administration conference (UNIX/Linux users group conference focused on system administration)
LOPSA - League of Professional System Administrators (voluntary organization of UNIX/Linux users involved in system administration)
LSM - Linux Security Modules (a mini-program providing system access controls that can be loaded into a system as a separate component)
LVM - logical volume management (a method of storage management, or disk partitioning, which allows for dynamic reallocation of disk space from unused or underused portions to areas needing more storage space)