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Internet



                                                                                  GATEWAY















                                 A            B            C             D            E
                                                Figure 6.24 Switch as Gateway







                                                        GATEWAY








                       A                               E         F                               J





                           B           C          D                G            H          I
                                                Figure 6.25 Router as Gateway



                 1.  Which network (LAN / MAN/PAN/WAN) covers the geographical area of a university campus?
                 2.  Which is the largest WAN existing on Earth?
                 3.  Name the device that connects two networks with different protocols.
                 4.  Can a router be replaced with a bridge?
                 5.  Which network device is used to connect computers to the local area networks?





             Let's Summarise



              Transfer  of  data  between  computers  (also  called  nodes  or  terminals)  via  some  channel  is  called  data
           Ø
              communication.

              Chat  provides  real-time  communication  between  two  or  more  users.  It  allows  the  connected  users  to
           Ø
              exchange messages in a chat window. Examples of chat applications include WhatsApp, Facebook messenger,
              and Telegram.



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