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1、OSI的中文名称和作用OSIopensystemconnectivitymodel[editingthissection]theOSImodelTheOSI/RMreferencemodelisproposedTheworld，sfirstnetworkarchitectureproposedbyIBM(74,SNA),afterothercompaniesalsosuccessivelyputforwardtheirownnetworkarchitecturesuchas:Digitalcompany，sDNA,thedefensedepartment'sTCP/IPand
2、soon,avarietyofnetworkarchitecture,asaresult,ifusingIBM，sstructure,canonlychooseIBMproducts,onlywiththesamestructureofnetworkinterconnection.Inordertopromotethedevelopmentofcomputernetwork,theinternationalorganizationforstandardization(ISOhassetupacommitteein1977,onthebasisoftheexistingnetw
3、ork,putforwardbasedonthespecifictype,operatingsystemornetworkarchitecture,calledopensystemsinterconnection(OSIreference,theopensysteminterconnection)modelThedesignpurposeoftheOSIOftheOSImodelisdesignedtobeanallsellerscanrealizeopennetworkmodel,usedtoovercomethemanydifficultiesbroughtbythepr
4、ivatenetworkmodelandinefficiency.OSIwascompletedundertheinvolvementofarespectedinternationalstandardsbody,ISO(ISO)・OSI,whichisanacronymforOpenSystemIntercorinection,isanOpenSystemInterconnectionrefereneemode1.InOSIbeforetheadventofthecomputerNetworkexistsinmanyArchitecture,ofwhichIBMSNA(sys
5、temsNetworkArchitecture)andtheDNAofDEC(DigitalNetworkArchitecture)DigitalNetworkArchitectureismostfamous・InordertosolvetheproblemofinternetworkingondifferentSystemstructureofnetwork,theinternationalorganizationforstandardization(ISO(becarefulnottomixedwithOSI)in1981formulatedtheOpensystemsI
6、nterconnectionReferenceModel(OpenSystemInterconnectionReferenceModel,theOSI/RM).ThismodeldividestheworkoftheNetworkcommunicationinto7layers,theyarefromlowtohighrespectivelyisthePhysicalLayer(PhysicalLayer),DataLinkLayer(DataLinkLayer),theNetworkLayer(NetworkLayer),TransportLayer,TransportLa
7、yer),theSessionLayer(theSessionLayer),thePresentationLayer(thePresentationLayer)andtheApplicationLayer,ApplicationLayer)・ThefirstlayertothethirdlayerbelongstothelowerthirdlayeroftheOSIreferencemodel,whichisresponsibleforcreatingthelinktonetworkcommunicat
