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3.  Name the four components of a communication system.
             Ans.  Sender, Receiver, Message and Channel.
               4.  Give any two ways to connect devices wirelessly.
             Ans.  Bluetooth, Wi-fi

               5.  Among LAN, MAN and WAN, which can cover the maximum area?
             Ans.  WAN

               6.  Define the term topology.
             Ans.   The physical arrangement of the computer systems in a computer network connected via communication medium is called
                  topology.

               7.  What are the disadvantages of bus topology?
             Ans.  (i) Locating a fault is difficult

                  (ii) It becomes slow with an increase in the number of nodes
               8.  Give three examples of the physical medium of communication.
             Ans.  Telephone line, coaxial cable and optical fibre.
               9.  Write functions of a modem.
             Ans.  Functions of modem in computer networking –
                 •  Data compression
                 •  Modulation/demodulation of signals
              11.  Differentiate between a router and a switch.

             Ans.                    Router                                            Switch
                   1.  The  main  objective  of  a  router is  to  connect  to  1.  The main objective of a switch is to connect various devices
                     various networks.                            in a local area network.
                   2. A router is used in all types of networks  2. A switch is typically  used in LANs.
              12.  Differentiate between a router and gateway.

             Ans.                    Router                                           Gateway
                   1.  It is used to manage and forward data packets to  1.  It  is  a  hardware  device  that  acts  as  a  gate  between  the
                     computer networks.                           networks.
                   2.  Works  by  installing  routing  details  for  multiple  2.  Ensures compatibility between the protocols of the incoming
                     networks and routes the traffic based upon the   and outgoing traffic.
                     destination address.

              13.  ABC University of Uttarakhand is setting up a secured network for its campus at Rishikesh for operating its day-to-day office
                  & web-based activities. They are planning to have network connectivity between four buildings.
                  Answer the question (i) to (iii) after going through the building positions in the campus and other details given below:


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