A local area network (LAN) is a group of computers and associated devices that share a common communications line or wireless link to a server. Typically, a LAN encompasses computers and peripherals connected to a server within a distinct geographic area such as an office or a commercial establishment. Computers and other mobile devices use a LAN connection to share resources such as a printer or network storage.A wide area network (WAN) is a geographically distributed private telecommunications network that interconnects multiple Local Area Networks (LANs). In an enterprise, a WAN may consist of connections to a Company's headquarters, branch offices, co-location facilities, cloud services and other facilities. Typically, router or other multifunction device is used to connect a LAN to a WAN. Enterprise WANs allow users to share access to applications, services and other centrally located resources. This eliminates the need to install the same application server, firewall or other resource in multiple locations
Need for fiber optics technology is constantly increasing,due to accelerating data rates and declining implementation cost.