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    LAN                                                       LAN

                                                           Metropolitan Area Network

                          WAN (Wide Area Network)

                     It 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

                                                         LAN                        LAN

                                                              Wide Area Network

                          PAN (Personal Area Network)

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

                                                                                           Tech Fact

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

                                   Personal Area Network

                                                                                                  Computer Networking  13

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