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判断Theswitchingofdata,voice,andothersignalsthroughanetworkisdonebyspecializedcomputers.(T)14.AkeyattributeofaLANisitslimitedgeographicscope.(T)15.StartopologiesarefrequentlyusedforLANs.(T)BustopologiesarefrequentlyusedforLANs（T）18.Subnetworksarecomponentsofinternetworks.(T)19.Anodeonanetworkisapointofconnectionintoanetwork,orapointatwhichoneormoretransmissionlines(circuits)interconnect,suchaswherearouteroraswitchconnectsintothenetwork.(T)27.Awirelessnetworkusesradiofrequencytechnologyasanextensionof,orasanalternativeto,awirednetwork.(T)30.Whenoneormoredistinctnetworksareinterconnected,theresultiscalledaninternet.(T)14.AkeyattributeofaLANisitslimitedgeographicscope.(T)15.StartopologiesarefrequentlyusedforLANs.(T)BustopologiesarefrequentlyusedforLANs（T）27.Awirelessnetworkusesradiofrequencytechnologyasanextensionof,orasanalternativeto,awirednetwork.(T)30.Whenoneormoredistinctnetworksareinterconnected,theresultiscalledaninternet.(T)10.Mostarchitecturesaredesignedforlong-termuse.(T)13.Computervendorshavebeenknowntodevelopproprietaryarchitecturestotrytolocktheircustomersintothevendor’sproductline.(T)16.Acommunicationsarchitecturesupportedbyappropriatestandardsmasksthephysicalconfigurationandcapabilitiesofthenetworkfromthelogicalrequirementsoftheuser.(T)21.AlayerintheOSImodelrepresentsacomponentofthetotalprocessofcommunicating.(T)23.Theapplicationlayer(layer7)intheOSImodelis“where”theuserworksataterminalwithcomputersoftware.(T)25.Asactualcommunicationssystemshavebeenimplementedovertheyears,mosthavenotstrictlyfollowedtheOSImodel.(T)40.TCP/IPhasbecomethedefactostandardprotocolforinternets.(T)41.TheInternetisanetworkofnetworks.(T)Atelephonecallisanexampleofaconnection-orientedservice.(T)DatalinkprotocolsarenotconcernedwithwhetherPDUsarriveinsequence.(T)Flowcontrolisatermusedtodescribetheabilityofthereceivingendofatransmissiontolimittherateofdatabeingsent.(T)WhenaPDUisbrokenintosmallerblocksfortransmission,theprocessiscalledfragmentation.(T)WhenaPDUisf
