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Router:  It  is a  networking  device  used  to  connect  and  facilitate  transfer  of  information
               between two networks. It is located at the gateways where two networks connect.
                Modem: It stands for MODULATOR – DEMODULATOR. It is a hardware device that is used
               to connect a computer to the Internet via a telephone line or a wireless medium. It converts
               data from digital to analog and vice versa. The process of converting analog signals to digital
               signals is called modulation. The process of converting digital signals to analog signals is

               called demodulation.
                Networking Cable: It is also known as Ethernet cable. It is a transmission medium that allows
               to transport information from one place to other place. There are various types of networking
               cables such as coaxial cable, twisted pair cable, and optical fiber cable.

                TYPES OF NETWORK

            Different types of networks can classified on the basis of geographical areas covered. There are
            five types of networks as follows:                                                       Workstation
            LAN (Local Area Network)

            It is a digital communication system that interconnects a larger                                Server
            number of computers and other peripheral devices within a radius
            of less than 1 km. This type of network is usually preferred for a

            smaller area such as a school building, computer lab, etc. The total
            diameter of LAN is not more than 5 km.
                               MAN
                                                                                        Local Area Network

                                                          MAN (Metropolitan Area Network)
               LAN                                LAN
                                                          This network consists of  two  or  more  local area
                                                          networks  or  campus area  networks  together  that
                                                          usually spans several buildings in the same city or
                                                          town.
               LAN
                                LAN              LAN

                     Metropolitan Area Network                               LAN                     LAN



            WAN (Wide Area Network)

            It is a digital communication system that interconnects
            a large number of computers in a wide geographical
            area.  This network  may operate  on  a  worldwide or
                                                                                           LAN
            nationwide basis. In such type of network, there may
            not be physical connection between  computers. In
            WAN telephone lines, microwave,  satellite links, etc.
            can be used as transmission medium.                                     Wide Area Network

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