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WAN (Wide Area Network)

                 WAN is a digital communication system that interconnects a large number of computers

                 over a wide geographical area. This network may operate on a worldwide  or nationwide
                 basis. In such type of network, there may not be physical connection between computers. In
                 WAN telephone lines, microwave, satellite links, etc., can be used as transmission medium.







                       LAN                     LAN                                  LAN                      LAN            COMPUTER NETWORKING










                                                    LAN                         LAN                                       23




                                                          Wide Area Network

                  PAN (Personal Area Network)

                 These are privately owned networks. PAN is used to establish the communication amongst
                 the computers within the range of 20 to 30 feet. It can be wired or wireless.






                                                                                     The  concept of a PAN
                                                                        Fun          was first  introduced  by
                                                                        Fact!
                                                                                     Thomas      Zimmerman       at
                                                                                     M.I.T.'s Media Lab. It was
                                                                                     later supported by  IBM's

                                                                                     Almaden research lab.




                           Personal Area Network


                  CAN (Campus Area Network)                                            Network
                                                                                          Campus
                                                                                          Area
                 CAN, also known as Cluster Area Network,
                 connects two or more LANs that are
                 limited to specific geographical areas, for

                 example, college campus, office building etc.
                                                                         Campus Area Network or Cluster Area Network
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