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1、ComputerNetworksandInternetsFIFTHEDITIONThispageintentionallyleftblankComputerNetworksandInternetsFIFTHEDITIONDOUGLASE.COMERCiscoResearchCisco,Inc.SanJose,CA95138andDepartmentofComputerSciencesPurdueUniversityWestLafayette,IN47907UpperSaddleRiver,NewJersey07
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6、ountries.MicrosoftWindowsisatrademarkofMicrosoftCorporation.MicrosoftisaregisteredtrademarkofMicrosoftCorporation.Windows95isatrademarkofMicrosoftCorporation.Windows98isatrademarkofMicrosoftCorporation.WindowsNTisatrademarkofMicrosoftCorporation.Solarisisatr
7、ademarkofSunMicrosystems,Incorporated.SnifferisatrademarkofNetworkGeneralCorporation.JavaisatrademarkofSunMicrosystems,Incorporated.JavaScriptisatrademarkofSunMicrosystems,Incorporated.AdaMagicisatrademarkofIntermetrics,Incorporated.SparcisatrademarkofSunMic
8、rosystems,Incorporated.AlphaisatrademarkofDigitalEquipmentCorporation.PentiumisatrademarkofIntelCorporationXWindowSystemisatrademarkofXConsortium,Incorporated.SmartjackisatrademarkofWestell,Inco
