Line Coding is a method of placing digital signals on a wire.
LEC stands for Local Exchange Carrier, is a telco in the United States that provides local telephone and telecommunication services to businesses and individuals.
LCP stands for Link Control Protocol, is a subprotocol within the Point-to-Point Protocol (PPP) protocol suite that is responsible for link management.
Layer 3 switch is an Ethernet switch that switches packets by looking at both their network address (for example, their IP or IPX address) and their physical address (for example, their MAC address).
L2F stands for Layer 2 Forwarding, is a media-independent tunneling protocol developed by Cisco Systems.
Link State Routing Algorithm is a routing method used by dynamic routers in which every router maintains a database of its individual autonomous system (AS) topology.