山东大学计算机网络课件.ppt

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1、TheMediumAccessControlSublayerChapter4TheChannelAllocationProblemStaticChannelAllocationinLANsandMANsDynamicChannelAllocationinLANsandMANsDynamicChannelAllocationinLANsandMANsStationModel.SingleChannelAssumption.CollisionAssumption.(a)ContinuousTime.(b)SlottedTime.(a)CarrierSense

2、.(b)NoCarrierSense.MultipleAccessProtocolsALOHACarrierSenseMultipleAccessProtocolsCollision-FreeProtocolsLimited-ContentionProtocolsWavelengthDivisionMultipleAccessProtocolsWirelessLANProtocolsPureALOHAInpureALOHA,framesaretransmittedatcompletelyarbitrarytimes.PureALOHA(2)Vulnerab

3、leperiodfortheshadedframe.PureALOHA(3)ThroughputversusofferedtrafficforALOHAsystems.PersistentandNonpersistentCSMAComparisonofthechannelutilizationversusloadforvariousrandomaccessprotocols.CSMAwithCollisionDetectionCSMA/CDcanbeinoneofthreestates:contention,transmission,oridle.Coll

4、ision-FreeProtocolsThebasicbit-mapprotocol.Collision-FreeProtocols(2)Thebinarycountdownprotocol.Adashindicatessilence.Limited-ContentionProtocolsAcquisitionprobabilityforasymmetriccontentionchannel.AdaptiveTreeWalkProtocolThetreeforeightstations.WavelengthDivisionMultipleAccessPro

5、tocolsWavelengthdivisionmultipleaccess.WirelessLANProtocolsAwirelessLAN.(a)Atransmitting.(b)Btransmitting.WirelessLANProtocols(2)TheMACAprotocol.(a)AsendinganRTStoB.(b)BrespondingwithaCTStoA.EthernetEthernetCablingManchesterEncodingTheEthernetMACSublayerProtocolTheBinaryExponentia

6、lBackoffAlgorithmEthernetPerformanceSwitchedEthernetFastEthernetGigabitEthernetIEEE802.2:LogicalLinkControlRetrospectiveonEthernetEthernetCablingThemostcommonkindsofEthernetcabling.EthernetCabling(2)ThreekindsofEthernetcabling.(a)10Base5,(b)10Base2,(c)10Base-T.EthernetCabling(3)Ca

7、bletopologies.(a)Linear,(b)Spine,(c)Tree,(d)Segmented.EthernetCabling(4)(a)Binaryencoding,(b)Manchesterencoding,(c)DifferentialManchesterencoding.EthernetMACSublayerProtocolFrameformats.(a)DIXEthernet,(b)IEEE802.3.EthernetMACSublayerProtocol(2)EthernetPerformanceEfficiencyofEthern

8、etat10Mbpswith512-bitslottimes.Sw