what is WAN (Wide Area Network ) ?

 Wide Area Network (WAN) – 

• WAN or Wide Area Network is a computer network that extends over a large geographical area, although it might be confined within the bounds of a state or country. 
• A WAN could be a connection of LAN connecting to other LAN’s via telephone lines and radio waves and may be limited to an enterprise (a corporation or an organization) or accessible to the public. 
• The technology is high speed and relatively expensive. 
• There are two types of WAN: Switched WAN and Point-to-Point WAN. 
• WAN is difficult to design and maintain. 
• Similar to a MAN, the fault tolerance of a WAN is less and there is more congestion in the network
• A Communication medium used for WAN is PSTN or Satellite Link. 
• Due to long distance transmission, the noise and error tend to be more in WAN. 
• WAN’s data rate is slow about a 10th LAN’s speed, since it involves increased distance and increased number of servers and terminals etc. Speeds of WAN ranges from few kilobits per second (Kbps) to megabits per second (Mbps). 
• Devices used for transmission of data through WAN are: Optic wires, Microwaves and Satellites.
• Example of a Switched WAN is the asynchronous transfer mode (ATM) network and Point-to-Point WAN is dial-up line that connects a home computer to the Internet. 

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