Saturday, May 30, 2015

Wide Area Network or WAN

WAN spans a large geographical area,often a country or continent. The job of the subnet is to carry messages from host to host,just as telephone system carries words from speaker to listener.
    In most wide area n/ws,the subnet consists of 2 distinct components : transmission lines & switching elements.
Transmission lines move bits between machines. They can be made of copper wire,optical fiber or even radio links.
When data arrive on an incoming line,the switching element must choose an outgoing line on which to forward them.
Switching element is also called router.

Next:WAN contn'd