When an individual Company or Organization has locations that are separated by large geographical distances, it will be a matter of necessity to connect these individual locations so as to share, exchange and manager data or communication. To achieve this, the organisation needs a Telecommunication Service Provider (TSP) to interconnect the LANs at the different locations.
Telecommunications Service Providers manage large area networks that can span long distances. TSPs transports voice and data communications on separate networks. These networks that connect LANs in geographically separated locations are referred to as Wide Area Networks (WANs).
Major characteristics of WANs:
WANs generally connect devices that are separated by a broader geographical area than cannot be served by a LAN.
WANs use the services of carriers, such as telephone companies, cable companies, satellite systems, and network providers.
WANs use serial connections of various types to provide access to bandwidth over large geographic area.