计算机网络原理（英文第四版）

计算机网络原理（英文第四版）
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. 本软件ID:1321895