The increasing demand and use of computers generated the need to provide high speed interconnections between computer systems. A Local Area Network (LAN) may serve as few as two or three users (for example, in a small office network) or several hundred users in a larger office. LAN networking comprises cables, switches, routers and other components that let users connect to internal servers, websites and other LANs via Wide Area Networks (WAN). Users can order printing and other services as needed through applications run on the LAN server. A user can share files with others stored in the LAN server, read and write access is maintained by a network administrator.
In some situations, a wireless LAN, or Wi-Fi, may be preferable to a wired LAN connection because of its flexibility and cost.
A PBX (Private Branch Exchange) is a telephone system within an organization that switches calls between organizational users on local lines while allowing all users to share a certain number of external phone lines. The main purpose of a PBX is to save the cost of requiring a line for each user to the telephone company’s central office.
The PBX is owned and operated by the organization rather than the telephone company (which may be a supplier or service provider).