Lan: Local Area Network
Lattice-based access controls: A method for implementing mandatory access controls in which a mathematical structure defines greatest lower-bound and least upper-bound values for a pair of elements: foe example, subject and object.
Layer 2 Forwarding Protocol (L2F): A virtual private network (VPN) protocol similar to Point-to-point tunneling Protocol (PPTP).
Layer 2 tunneling Protocol (L2TP): A virtual private Network (VPN) protocol similar to Point-to-point tunneling protocol (PPTP) and layer 2 forwarding protocol (L2F).
Least Privilege: A principe requiring that a subject is granted only the minimum privileges necessary to perform an assigned task.
Lightweight Directory Access Protocol (LDAP): An Internet protocol (IP) and data storage model that support authentication and directory functions.
Link encryption: Packet encryption and decryption at every node along the network path; requires each node to have separate key pairs for its upstream and downstream neighbors.
Logic bomb: A program, or portion thereof, designed to perform some malicious function when a predetermined circumstance occurs.