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(iv)   Due to pandemic school had to adopt Online classes. Suggest the protocol that is used for sending the voice signals
                     over internet. Also, give an example of an application of WWW that helped the teachers to send messages instantly to
                     the students
             Ans.  (i)  Star topology
                                                                W2


                                                     W1
                                                                        W4



                                                          W3
                  (ii)  a. LAN

                     b. WAN
                  (iii)  a. As per cable layout given Repeater can be placed in between W3 and W4 wing.
                     b. Hub or switch can be placed in each wing.


                                            NCERT Exercise Solutions


               1.  Fill in the blanks:
                  a.  To transmit data for sharing on a network, it has to be divided into smaller chunks called ____________ .
                  b.  The set of rules that decide the functioning of a network is called ____________ .
                  c.  A LAN can be extended up to a distance of ____________ km.
                  d.  The ____________ connects a local area network to the internet.
                  e.  The ____________ topology is of hierarchical nature.
                  f.  ____________ is a standard naming convention used for accessing resources over the Internet.
                  g.  ____________ is a collection of related web pages.
                  h.  A ____________ is a computer that provides services to other programs or computers.
             Ans.   a.  packets      b.  protocols      c.  1 or ONE         d.  router
                  e.  tree        f.  URL              g.  Website           h.  Server
               2.  Expand the following:
                  a.  ARPANET
                  b.  ISP
                  c.  URL
             Ans.  a.  Advanced Research Project Agency Network
                  b.  Internet Service Provider

                  c.  Uniform Resource Locator
               3.  Name the device for the following:
                  a.  It stands for Modulator Demodulator
                  b.  It regenerates the signals.
             Ans.  a.  Modem
                  b.  Repeater








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