思科网络技术培训之2：基本概念

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1、Chapter2InternetworkingConceptsOverviewObjectivesOncompletionofthischapter,youwillbeabletoperformthefollowingtasks:DescribehowdatatrafficisexchangedbetweensourceanddestinationdevicesIdentifytherolesandfunctionsofahub,switch,androuter,andwheretheybestfit

2、inthenetworkSelecttheappropriateCiscoequipmentforagivensetofnetworkrequirementsDefiningComponentsoftheNetworkMainOfficeBranchOfficeHomeOfficeMobileUsersInternetredundencyFloor2Floor1ServerFarmDefiningtheComponentsofaNetwork(cont.)BranchOfficeTelecommut

3、erISDNRemoteCampusNetworkStructureDefinedbyHierarchyDistributionLayerCoreLayerAccessLayerAccessLayerCharacteristicsEndstationentrypointtothenetworkAccessLayerDistributionLayerCharacteristicsAccessLayerAggregationPointRoutestrafficBroadcast/MulticastDo

4、mainsMediaTranslationSecurityPossiblepointforremoteaccessDistributionLayerCoreLayerCharacteristicsFasttransporttoenterpriseservicesNopacketmanipulationCoreLayerOSIModelOverviewDataFlowLayersTransportLayerDataLinkNetworkLayerPhysicalApplication(Upper)Lay

5、ersSessionPresentationApplication注意OSI模型与网络三个层次的区别Keepingdifferentapplications’dataseparateUserInterfaceHowdataispresentedSpecialprocessingsuchasencryptionTelnetHTTPASCIIEBCDICJPEGOperatingSystem/ApplicationAccessSchedulingTransportLayerDataLinkNetworkL

6、ayerPhysicalEXAMPLESSessionPresentationApplicationRoleofApplicationLayersTCPUDPSPX802.3/802.2HDLCEIA/TIA-232V.35IPIPXPresentationApplicationSessionEXAMPLESRoleofDataFlowLayersReliableorunreliabledeliveryErrorcorrectionbeforeretransmitCombinesbitsintoby

7、tesandbytesintoframesAccesstomediausingMACaddressErrordetectionnotcorrectionMovebitsbetweendevicesSpecifiesvoltage,wirespeedandpin-outcablesTransportDataLinkPhysicalNetworkProvidelogicaladdressingwhichroutersuseforpathdeterminationEncapsulatingDataTra

8、nsportDataLinkPhysicalNetworkUpperLayerDataUpperLayerDataTCPHeaderDataIPHeaderDataLLCHeader0101110101001000010DataMACHeaderPresentationApplicationSessionSegmentPacketBitsFramePDUFCSFCSProtocoldataunitsUpperLayerDataDe-encapsulati