The computer networkisacollection of computers, printersandother equipmentare connected. Informationand datamovesthroughthe wiresto allownetwork usersto exchangedocuments anddata, print on the same printerandtogether usinghardware/software that is connectedto thenetwork. Eachcomputer, printer orperipherals connecteddenganjaringancalled anode. Acomputer networkcan have two, tens, thousands oreven millions ofnodes. A networktypically consistsoftwoormore computersthat are interconnectedamongeach other, andshare resourcessuch asCDROM, Printer, exchange files, orallow it tocommunicate with each otherelectronically.Connected computer, the possiblecontactwith the mediacables, telephone lines, radio waves, satellites, orinfrared rays.