Page 5 - DISCOVER
P. 5

Open network                                           Closed network


                                                              It is part of the open network, but it is
       It is open and accessible to all
                                                              specific to a specific part
       Ex: internet
                                                              Ex: school lab


                 A timeline of the technological development of the internet

                 ➢ 80s (Dial up internet connection)
              Used phone line to connect to internet, it’s slow but stable connection.

              Couldn’t use phone when on internet.

                 ➢ Late 80s (Digital Subscriber line (DSL)

              A high-speed connection that uses phone wires to connect to the
              internet.

              Allowing the phone and the internet to be used simultaneously (at the
              same time).


                 ➢ 90s (Emergence of the world wide web)

              WWW is a large set of web pages that are linked to each other using
              hyperlinks.





                 ➢ 2000+ (Wi-Fi devices)
              You can access the internet from your smartphone through Wi-Fi,

              Portable internet service and Hotspots.










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