摘自计算机网络原理书(前言):Thisbookisnowinitsfourthedition.Eacheditionhascorrespondedtoadifferentphaseinthewaycomputernetworkswereused.Whenthefirsteditionappearedin1980,networkswereanacademiccuriosity.Whenthesecondeditionappearedin1988,networkswereusedbyuniversitiesandlargebusinesses.Whenthethirdeditionappearedin1996,computernetworks,especiallytheInternet,hadbecomeadailyrealityformillionsofpeople.Thenewiteminthefourtheditionistherapidgrowthofwirelessnetworkinginmanyforms.Thenetworkingpicturehaschangedradicallysincethethirdedition.Inthemid-1990s,numerouskindsofLANsandWANsexisted,alongwithmultipleprotocolstacks.By2003,theonlywiredLANinwidespreadusewasEthernet,andvirtuallyallWANswereontheInternet.Accordingly,alargeamountofmaterialabouttheseoldernetworkshasbeenremoved.However,newdevelopmentsarealsoplentiful.Themostimportantisthehugeincreaseinwirelessnetworks,including802.11,wirelesslocalloops,2Gand3Gcellularnetworks,Bluetooth,WAP,i-mode,andothers.Accordingly,alargeamountofmaterialhasbeenaddedonwirelessnetworks.Anothernewly-importanttopicissecurity,soawholechapteronithasbeenadded.
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计算机网络
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