Page 11 - ModularV1.1 _c8_flipbook
P. 11

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 wireless medium. It converts
                    data from digital to analog and vice versa. The process of converting analog signals to digital
                    signals is called demodulation. The process of converting digital signals to analog signals is
                    called modulation.
                    Networking Cable: It is also known as Ethernet cable. It is a transmission medium that allows
                    to transport information from one place to another. There are various types of networking
                    cables such as coaxial cable, twisted pair cable, and optical fiber cable.

                     TYPES OF NETWORK

                 Networks can be classified into different types on the basis of geographical areas covered. There
                 are five types of networks as follows:                                                  Workstation
                 LAN (Local Area Network)
                                                                                                                Server
                 It is a digital communication system that interconnects a larger
                 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 nationwide
                 basis. In such type of network, there may not                                 LAN
                 be physical connection between  computers.
                 In WAN telephone  lines,  microwave,  satellite

                 links, etc. can be used as transmission medium.                         Wide Area Network






                                                                                            Computer Networking    9
   6   7   8   9   10   11   12   13   14   15   16