Internet & Home Networking
                           Contents
            Data Communication Network
            Internet & World Wide Web
            Home Networking
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                                    Internet & Home Networking
      Data Communication Network
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                                              Internet & Home Networking
       Brief History of Computer Networks
          • 1960’s –  “How can we transmit bits across a 
            communication medium efficiently and reliably?”
          • 1970’s –  “How can we transmit packets across a 
            communication medium efficiently and reliably?”
          • 1980’s –  “How can we provide communication 
            services across a series of interconnected 
            networks?
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                                             Internet & Home Networking
         • 1990’s –  “How can we provide high-speed, 
           broadband communication services to support 
           high-performance computing and multimedia 
           applications across the globe?”
         • 2000's –  What do you think will dominate in the 
           next 10 years?
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                                                                                    Internet & Home Networking
            A Communication Model
                     1               2                3                4               5               6
                     Input      Input data g      Transmitted       Received     Output data g’       Output
                 Information      or signal          signal          signal         or signal       Information
                       m             g(t)              s(t)            r(t)           g’(t)              m’
                                                                                         ’
                  r                                                                                            r
                  e                                                                                            e
                                                                                                               v
                  d        Input                         Transmission                        Output            i
                  n                     Transmitter                         Receiver                           e
                  e       Device                           medium                            Device            c
                  S                                                                                            e
                                                                                                               R
                                Source System                                   Destination System
                                                                                                                        6