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Layer 2 Forwarding Protocol (L2F):

An Internet protocol (originally developed by Cisco Corporation) that uses tunneling of PPP over IP to create a virtual extension of a dial-up link across a network, initiated by the dial-up server and transparent to the dial-up user .

Layer 2 Tunneling Protocol (L2TP):

An extension of the Point-to-Point Tunneling Protocol used by an Internet service provider to enable the operation of a virtual private network over the Internet.

Legal Health Record (LHR):

All individually identifiable data, in any medium collected and directly used in health care or for documenting care or health status.

Lightweight Directory Access Protocol (LDAP):

A software protocol for enabling anyone to locate organizations, individuals, and other resources such as files and devices in a network, whether on the public Internet or on a corporate intranet.