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ID:59423279
大小:3.64 MB
页数:43页
时间:2020-09-19
《Cisco 思科 网络 技术 培训 文档 ppt课件.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、ObjectivesUponcompletionofthischapter,youwillbeableto:IdentifythecomponentsthatmakeuptheSNAenvironmentandthefunctionofeachComparedifferentmethodsofdoingSNAinternetworkingandlistthebenefitsofeachDescribedifferenttopologiesusedinSNAdesignsChapterTopicsSNAoverviewSNAcomponentsToke
2、nRinggatewaysSNAinternetworkingBusinessandtechnicalrequirementsSNATokenRinginternetworkingSNAinternetworkingtopologiesSNAIntroductionSNAisahost-centric,hierarchicalnetworkarchitectureHostloadisreducedbecausetheFEPtakesoverthecharacterhandlingandpollingfunctionsHostrunningVTAMFr
3、ont-endprocessor(FEP)ClustercontrollerSNANetworkAddressableUnits(NAUs)DataflowcontrolTransmissioncontrolPathcontrolData-linkcontrolDataflowcontrolTransmissioncontrolDataflowcontrolTransmissioncontrolManagesend-userservicesLogicalUnitControlsandmanagesresourcesforaspecificnetwor
4、knodePhysicalUnitControlsandmanagesSNAnetworkresourcesinadomainSystemServicesControlPointTheSNAHierarchy:SubareaNodesES9000or370CICS,TSO,andsoforthVTAMandSSCPHostcomputerormainframeHostsubsystemsorprimarylogicalunits(PLUs)SNAsoftwareandnodetype5(PU5)3745NCPCommunicationcontroll
5、erorFEPSNAsoftwareandnodetype4(PU4)Channel—busandtagorESCONTheSNAHierarchy:PeripheralNodes3745NCPCommunicationcontrollerorFEPSNAsoftwareandnodetype4(PU4)3174Logicalunits(LUs)SDLCorTokenRinglinkEnterprisecontrollerorclustercontrollerNodetype2(PU2)—peripheralnodetoSNA3270terminal
6、attachedtosecondaryLU(SLU)LU-LUSessionSupportsEnd-UserCommunicationUsertaskinCICSorTSOPrimaryLUTerminalwindowSLUAnLU-LUsessiontakesplaceaftertheSSCP-LUandSSCP-PUconnectionsaremadeTheSNASubareaSNAdefinesasubareatobeasubareanodeandalltheperipheralnodesattachedtoitSubarea1Subarea2
7、Subarea4Subarea5Subarea3AccesstoSNAbyTokenRingGatewaysTokenRingdevicescanappearasPUtype2orasjustanLUGatewayFEPHostPUGateway:Pass-ThroughGatewayPUineveryPCinsessionwithSSCPPUgatewaySSCPtoPUsessionFEPHostLUGateway:CollocatedwithHostClientPCOnlyonedownstreamPU(DSPU)—onLUgatewayLUg
8、atewaySSCPtoPUsessionNetBIOSsessionRemoteLUGateway:Col
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