| LAN (Local Area Network) | |
| A network that interconnects devices over a geographically small area, typically in one building or a part of a building. The most popular LAN type is Ethernet. LANs allow the sharing of resources and the exchange of both video and data. | |
| LAN/WAN Connectivity | |
| This is the practical set of tools, from OS layer protocols to support services that make a remote access device an effective link between LANs and WANs. An effective remote access server must include a host of communications and translation protocols to fulfil this function. | |
| Latency | |
| The minimum time required to move data from one point to another. Once latency is present, it cannot be optimised. The cause has to be removed (as in using an internal device rather than an external one to remove the latency caused by the serial port). To maximize throughput, use the highest bandwidth available. | |
| Leased Lines | |
| A circuit rented for exclusive use twenty-four hours a day, seven days a week from a telephone company. The connection exists between two predetermined points and cannot be switched to other locations. | |