第二章 TcpIP讨论ppt课件.ppt

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1、Chapter2TheOSIModelandTCP/IPProtocolSuiteCONTENTSTHEOSIMODELLAYERSINTHEOSIMODELTCP/IPPROTOCOLSUITEADDRESSINGTCP/IPVERSIONSTHEOSIMODEL2.1ISOistheorganization.OSIisthemodel.Figure2-1OSIModelFigure2-2OSIlayersHeadersareaddedtothedataatlayers6,5,4,3,and2.Trailersareusuallyaddedonlyatlaye

2、r2.Figure2-3AnexchangeusingtheOSImodelLAYERSINTHEOSIMODEL2.2Figure2-4PhysicalLayerFigure2-5DataLinkLayerFigure2-6Node-to-nodedeliveryFigure2-7NetworkLayerFigure2-8End-to-enddeliveryFigure2-9TransportLayerFigure2-10Reliableend-to-enddeliveryofamessageFigure2-11SessionLayerFigure2-12Presentat

3、ionLayerFigure2-13ApplicationLayerFigure2-14SummaryoflayersTCP/IPPROTOCOLSUITE2.3Figure2-15TCP/IPandOSImodelADDRESSING2.4Figure2-16AddressesinTCP/IPFigure2-17Relation-shipoflayersandaddressesinTCP/IPExample1Figure2.18showsanexampleofphysicaladdresses.Figure2-18PhysicaladdressesExample2Mostl

4、ocalareanetworksusea48-bit(6bytes)physicaladdresswrittenas12hexadecimaldigits,withevery2bytesseparatedbyahyphenasshownbelow:07-01-02-01-2C-4BA6-byte(12hexadecimaldigits)physicaladdressExample3Figure2.19showsanexampleofInternetaddresses.Figure2-19IPaddressesExample4AswewillseeinChapter4,anIn

5、ternetaddress(inIPv4)is32bitsinlength,normallywrittenasfourdecimalnumbers,witheachnumberrepresenting1byte.Thenumbersareseparatedbyadot.Belowisanexampleofsuchanaddress.132.24.75.9Example5Figure2.20showsanexampleoftransportlayercommunication.Figure2-20PortaddressesExample6AswewillseeinChapter

6、s11and12,aportaddressisa16-bitaddressrepresentedbyonedecimalnumberasshownbelow.753A16-bitportaddressTCP/IPVERSIONS2.5Versions:Version4(current)Version5Version6(future)