LAN   A Local Area Network is a group of PC's, Other Computers & Peripheral Devices, which are linked together, where each device is located in close proximity to all the other devices. LANs typically consist of a number of PC's, shared printers & Shared Directories & Files. Leased-line   Refers to a telephone line that is rented for exclusive 24-hour, 7 -days-a-week use from your location to another location. The highest speed data connections require a leased line.