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ENetworkChapter2-CCNAExploration：Network(2009-05-1011:32:50)标签：分类：CCNA.CISCO.ANSWERSitPostedbySpaceonSunday,May10,20091Whatarethekeyfunctionsofencapsulation?(Choosethree.)*allowsmodificationoftheoriginaldatabeforetransmission*identifiespiecesofdataaspartofthesamecommunication*enablesconsistentnetworkpathsforcommunicationensuresthatdatapiecescanbedirectedtothecorrectreceivingenddeviceenablesthereassemblyofcompletemessagestracksdelaybetweenenddevices2Whichlayerencapsulatesthesegmentintopackets?physicaldatalink*networktransport3WhichthreestatementsbestdescribeaLocalAreaNetwork(LAN)?(Choosethree.)*ALANisusuallyinasinglegeographicalarea.*Thenetworkisadministeredbyasingleorganization.TheconnectionbetweensegmentsintheLANisusuallythroughaleasedconnection.Thesecurityandaccesscontrolofthenetworkarecontrolledbyaserviceprovider.*ALANprovidesnetworkservicesandaccesstoapplicationsforuserswithinacommonorganization.EachendofthenetworkisgenerallyconnectedtoaTelecommunicationServiceProvider(TSP).4WhatistheproperorderofthelayersoftheOSImodelfromthehighestlayertothelowestlayer?physical,network,application,datalink,presentation,session,transportapplication,physical,session,transport,network,datalink,presentationapplication,presentation,physical,session,datalink,transport,network*application,presentation,session,transport,network,datalink,physicalpresentation,datalink,session,transport,network,physical,application5Duringtheencapsulationprocess,whatoccursatthedatalinklayer?Noaddressisadded.Thelogicaladdressisadded.*Thephysicaladdressisadded.Theprocessportnumberisadded.6Selectthestatementsthatarecorrectconcerningnetworkprotocols.(Choosethree.)definethestructureoflayerspecificPDU's*dictatehowtoaccomplishlayerfunctions*outlinethefunctionsnecessaryforcommunicationsbetweenlayerslimithardwarecompatibility*requirelayerdependentencapsulationseliminatestandardizationamongvendors7Refer
