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NewWordsandExpressionsReal-timeTransferProtocol实时传输协议ResourceReservationProtocol资源保留协议tacticaladj.战术的QuestionWhendeployingGigabitEthernet’sswitches,youwillnoticewhatthings?UNIT26GigabitEthernetGigabitEthernetcouldn’thappenatabettertime.Buildingontheproliferationofswitched10Mand100Mbit/secEthernetdevices,1Gbit/secEthernetisanelegantandtimelynextstep.ButGigabitEthernetisnotasimplescalingupoftheEthernetwealreadyknow.1Althoughitshouldreadilyfitintoexistingnetworksandbeeasylouseandmanage,thissuperchargedEthernettechnologyentailsmorerobustproductengineering.2Here’salookatthetypesofGigabitEthernetproductsthatwillappearinthemarketbymid1997andwhatusersshouldlookforinevaluatingtheseproducts.Fivetypesofhardwarewillappeartoservethegigabitmigration:GigabitEthernetnetworkinterfacecards(NIC),aggregatingswitchesthatconnect100Mand1Gbit/Ethernetsegments,all-gigabitEthernetswitches,all-gigabitEthernetrepeatersandgigabitenabledrouters.Inconsideringgigabit-persecondupgradesforserversandpowerworkstations,usersmustselectGigabitEthernetNICscarefully.3At1Gbit/sec,CPUscannotkeepupwithnetworkthroughputunlesstheNICprovidesintelligent,hostassistfunctions.ThisalsowillapplytoGigabitEthernetinterfacesonroutersandmayexistinglowercapacityswitches.Traditionally,aworkstation’sthroughputdependsonitsbusandmemoryarchitecture,aswellasitsCPUspeed.4Withthe32bitPCIbus,computershavethecapacitytobursttrafficat1Gbit/sec.The64bitPCIbushashigherthroughput(2Gbit/sec).Thisfasterbusspeedisamajorfactoringigabitreadiness.But,atsuchspeed,thesystemCPUcaneasilyconsume10applicationsandthenet,leavingnoprocessingpowerforapplicationsorotherope
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