多項選擇題
WhydoesthedatacommunicationindustryusethelayeredOSIreferencemodel？（Choosetwo.)（）
A.Itdividesthenetworkcommunicationprocessintosmallerandsimplercomponents，thusaidingcomponentdevelopment，design，andtroubleshooting.
B.Itenablesequipmentfromdifferentvendorstousethesameelectroniccomponents，thussavingresearchanddevelopmentfunds.
C.Itsupportstheevolutionofmultiplecompetingstandards，andthusprovidesbusinessopportunitiesforequipmentmanufacturers.
D.Itencouragesindustrystandardizationbydefiningwhatfunctionsoccurateachlayerofthemodel.
E.Itprovidesameansbywhichchangesinfunctionalityinonelayerrequirechangesinotherlayers.
WhydoesthedatacommunicationindustryusethelayeredOSIreferencemodel？（Choosetwo.)（）
A.Itdividesthenetworkcommunicationprocessintosmallerandsimplercomponents，thusaidingcomponentdevelopment，design，andtroubleshooting.
B.Itenablesequipmentfromdifferentvendorstousethesameelectroniccomponents，thussavingresearchanddevelopmentfunds.
C.Itsupportstheevolutionofmultiplecompetingstandards，andthusprovidesbusinessopportunitiesforequipmentmanufacturers.
D.Itencouragesindustrystandardizationbydefiningwhatfunctionsoccurateachlayerofthemodel.
E.Itprovidesameansbywhichchangesinfunctionalityinonelayerrequirechangesinotherlayers.
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Whichstatementistrueaboutfull-duplexEthernetincomparisontohalf-duplexEthernet？（）
Whichstatementistrueaboutfull-duplexEthernetincomparisontohalf-duplexEthernet？（）
A.Full-duplexEthernetconsistsofasharedcablesegment.Half-duplexEthernetprovidesapoint-to-pointlink.B.Full-duplexEthernetusesaloopbackcircuittodetectcollisions.Half-duplexEthernetusesajamsignal.C.Full-duplexEthernetcanprovidehigherthroughputthancanhalf-duplexEthernetofthesamebandwidth.D.Full-duplexEthernetusestwowirestosendandreceive.Half-duplexEthernetusesonewiretosendandreceive.