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OSIDataLinkLayerCCNAExplorationSemester2Chapter7OSIDataLinkLayerCCNAExplor1MRajab-2019OSIdatalinklayerOSImodellayer2TCP/IPmodelpartofNetworkAccesslayerApplicationPresentationSessionTransportNetworkDatalinkPhysicalApplicationTransportInternetNetworkAccessTCP,UDPIPEthernet,WANtechnologiesHTTP,FTP,TFTP,SMTPetcSegmentPacketFrameBitsDatastreamMRajab-2019OSIdatalinklay2ObjectivesExplaintheroleofDataLinklayerprotocolsindatatransmission.DescribehowtheDataLinklayerpreparesdatafortransmissiononnetworkmedia.Describethedifferenttypesofmediaaccesscontrolmethods.Identifyseveralcommonlogicalnetworktopologiesanddescribehowthelogicaltopologydeterminesthemediaaccesscontrolmethodforthatnetwork.Explainthepurposeofencapsulatingpacketsintoframestofacilitatemediaaccess.DescribetheLayer2framestructureandidentifygenericfields.Explaintheroleofkeyframeheaderandtrailerfields,includingaddressing,QoS,typeofprotocol,andFrameCheckSequenceObjectivesExplaintheroleof3MRajab-2019FunctionsofdatalinklayerEncapsulatespacketsbyaddingaframeheaderandtrailerincludingappropriateaddressing.Controlsaccesstothetransmissionmedium.MRajab-2019Functionsofdata4MRajab-2019HopsTheremaybeadifferentlayer2protocolinuseoneachhopofajourney.Differentmedia,differenttypesoflink,differentbandwidths,LAN/WANaffectthechoiceofprotocol.Differentprotocolshavedifferentframes.Therouterremovestheoldframeandaddsanewheaderandtrailerforthenexthop.MRajab-2019HopsTheremaybe5DataLinkFlowBetweenMediumsDataLinkFlowBetweenMediums6DataLinkFlowBetweenMediumsDataLinkFlowBetweenMediums7DataLinkFlowBetweenMediumsDataLinkFlowBetweenMediums8MRajab-2019Layer2frameformatAllprotocolshavethesamegeneralformbuttherearevariations.MRajab-2019Layer2framefor9CreatingLayer2FrameCreatingLayer2Frame10ConnectingupperlayertoMediaConnectingupperlayertoMedi11MRajab-2019DataLinkSublayersDatalinkPhysicalNetworkLogicallinkcontrolMediaaccesscontrolAddslayer2address.

Marksframestartandend.Setsuptheframeheaderandtrailertoencapsulatethepacket.

Identifiesnetworklayerprotocol.MRajab-2019DataLinkSublay12DataLinkSublayersDataLinkSublayers13StandardsStandards14MediaAccessControlMethodsMediaAccessControlMethods15MRajab-2019SharedmediumNeedsmediaaccesscontrol.Ifthereisnocontroltherewillbemanycollisionsandtheframeswillbedestroyed.PhysicalbusStarwithhubMRajab-2019SharedmediumNeedMRajab-2019PointtopointlinkOnlytwodevicesonthenetworkFullduplex:bothcansendatthesametime,noproblemwithmediaaccessHalfduplex:datacanonlytravelonewayatatimesoonedevicecansendatatime.Simplemediaaccesscontrol.MRajab-2019Pointtopointli17MRajab-2019ControlledmediaaccessPredictable,deterministic.Eachdeviceisgivenatimewhenitmaysend,anditmostnotsendatanyothertime.Highoverhead.Nocollisions.Tokenpassing–eachhostinturngetsthetokenandisallowedtosend.E.g.tokenring,FDDIMRajab-2019Controlledmedia18ControlledmediaaccessControlledmediaaccess19MRajab-2019ContentionbasedmediaaccessNon-deterministic,firstcomefirstserved.Eachdevice“listens”andsendswhenthemediumseemstobeclear.Lowoverhead.Collisionsoccur.Needawayofre-sendinglostframes.Becomesinefficientonlargenetworks.E.g.traditionalEthernet.MRajab-2019Contentionbased20ContentionbasedmediaaccessContentionbasedmediaaccess21MRajab-2019VariationoncontentionbasedTraditionalEthernetusesCSMA/CD(collisiondetection):collisionsareallowedanddetected,framessentagain.Wi-fiusesCSMA/CA(collisionavoidance):whenthemediumisclear,hostsendssignaltosayitisabouttousethemedium.Itthensends.MRajab-2019Variationoncont22QuizTrueorfalseQuizTrueorfalse23LogicalPoint-to-pointLogicalPoint-to-point24LogicalPoint-to-pointLogicalPoint-to-point25MultiAccessTopologyMultiAccessTopology26OSI-Data-Link-Layer---WikispacesOSI数据链路层的wiki空间课件27MRajab-2019EthernetframeMulti-accesslinks.Fulladdressing.

Nocontrolfield.SameforallEthernettypes/bandwidths.TimingandstartAddresses

48bitseachLayer3protocolPacketCheckandstopMRajab-2019EthernetframeMul28MRajab-2019PPPframePointtopointlinks.Minimaladdressing.Controlmechanisms.StartMinimaladdressPacketCheckandstopMRajab-2019PPPframePointto29OSIDataLinkLayerCCNAExplorationSemester2Chapter7OSIDataLinkLayerCCNAExplor30MRajab-2019OSIdatalinklayerOSImodellayer2TCP/IPmodelpartofNetworkAccesslayerApplicationPresentationSessionTransportNetworkDatalinkPhysicalApplicationTransportInternetNetworkAccessTCP,UDPIPEthernet,WANtechnologiesHTTP,FTP,TFTP,SMTPetcSegmentPacketFrameBitsDatastreamMRajab-2019OSIdatalinklay31ObjectivesExplaintheroleofDataLinklayerprotocolsindatatransmission.DescribehowtheDataLinklayerpreparesdatafortransmissiononnetworkmedia.Describethedifferenttypesofmediaaccesscontrolmethods.Identifyseveralcommonlogicalnetworktopologiesanddescribehowthelogicaltopologydeterminesthemediaaccesscontrolmethodforthatnetwork.Explainthepurposeofencapsulatingpacketsintoframestofacilitatemediaaccess.DescribetheLayer2framestructureandidentifygenericfields.Explaintheroleofkeyframeheaderandtrailerfields,includingaddressing,QoS,typeofprotocol,andFrameCheckSequenceObjectivesExplaintheroleof32MRajab-2019FunctionsofdatalinklayerEncapsulatespacketsbyaddingaframeheaderandtrailerincludingappropriateaddressing.Controlsaccesstothetransmissionmedium.MRajab-2019Functionsofdata33MRajab-2019HopsTheremaybeadifferentlayer2protocolinuseoneachhopofajourney.Differentmedia,differenttypesoflink,differentbandwidths,LAN/WANaffectthechoiceofprotocol.Differentprotocolshavedifferentframes.Therouterremovestheoldframeandaddsanewheaderandtrailerforthenexthop.MRajab-2019HopsTheremaybe34DataLinkFlowBetweenMediumsDataLinkFlowBetweenMediums35DataLinkFlowBetweenMediumsDataLinkFlowBetweenMediums36DataLinkFlowBetweenMediumsDataLinkFlowBetweenMediums37MRajab-2019Layer2frameformatAllprotocolshavethesamegeneralformbuttherearevariations.MRajab-2019Layer2framefor38CreatingLayer2FrameCreatingLayer2Frame39ConnectingupperlayertoMediaConnectingupperlayertoMedi40MRajab-2019DataLinkSublayersDatalinkPhysicalNetworkLogicallinkcontrolMediaaccesscontrolAddslayer2address.

Marksframestartandend.Setsuptheframeheaderandtrailertoencapsulatethepacket.

Identifiesnetworklayerprotocol.MRajab-2019DataLinkSublay41DataLinkSublayersDataLinkSublayers42StandardsStandards43MediaAccessControlMethodsMediaAccessControlMethods44MRajab-2019SharedmediumNeedsmediaaccesscontrol.Ifthereisnocontroltherewillbemanycollisionsandtheframeswillbedestroyed.PhysicalbusStarwithhubMRajab-2019SharedmediumNeedMRajab-2019PointtopointlinkOnlytwodevicesonthenetworkFullduplex:bothcansendatthesametime,noproblemwithmediaaccessHalfduplex:datacanonlytravelonewayatatimesoonedevicecansendatatime.Simplemediaaccesscontrol.MRajab-2019Pointtopointli46MRajab-2019ControlledmediaaccessPredictable,deterministic.Eachdeviceisgivenatimewhenitmaysend,anditmostnotsendatanyothertime.Highoverhead.Nocollisions.Tokenpassing–eachhostinturngetsthetokenandisallowedtosend.E.g.tokenring,FDDIMRajab-2019Controlledmedia47ControlledmediaaccessControlledmediaaccess48MRajab-2019ContentionbasedmediaaccessNon-deterministic,firstcomefirstserved.Eachdevice“listens”andsendswhenthemediumseemstobeclear.Lowoverhead.Collisionsoccur.Needawayofre-sendinglostframes.Becomesinefficientonlargenetworks.E.g.traditionalEthernet.MRajab-2019Contentionbased49ContentionbasedmediaaccessContentionbasedmediaaccess50MRajab-2019Vari

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