思科网络技术培训之2：基本概念

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

2、mentforagivensetofnetworkrequirementsDefiningComponentsoftheNetworkMainOfficeBranchOfficeHomeOfficeMobileUsersInternetredundencyFloor2Floor1ServerFarmDefiningtheComponentsofaNetwork(cont.)BranchOfficeTelecommuterISDNRemoteCampusNetworkStructureDefinedbyHierarchyDistributionLayerCoreLayerAccess

3、LayerAccessLayerCharacteristicsEndstationentrypointtothenetworkAccessLayerDistributionLayerCharacteristicsAccessLayerAggregationPointRoutestrafficBroadcast/MulticastDomainsMediaTranslationSecurityPossiblepointforremoteaccessDistributionLayerCoreLayerCharacteristicsFasttransporttoenterpriseser

4、vicesNopacketmanipulationCoreLayerOSIModelOverviewDataFlowLayersTransportLayerDataLinkNetworkLayerPhysicalApplication(Upper)LayersSessionPresentationApplication注意OSI模型与网络三个层次的区别Keepingdifferentapplications’dataseparateUserInterfaceHowdataispresentedSpecialprocessingsuchasencryptionTelnetHTTPASC

5、IIEBCDICJPEGOperatingSystem/ApplicationAccessSchedulingTransportLayerDataLinkNetworkLayerPhysicalEXAMPLESSessionPresentationApplicationRoleofApplicationLayersTCPUDPSPX802.3/802.2HDLCEIA/TIA-232V.35IPIPXPresentationApplicationSessionEXAMPLESRoleofDataFlowLayersReliableorunreliabledeliveryErrorc

6、orrectionbeforeretransmitCombinesbitsintobytesandbytesintoframesAccesstomediausingMACaddressErrordetectionnotcorrectionMovebitsbetweendevicesSpecifiesvoltage,wirespeedandpin-outcablesTransportDataLinkPhysicalNetworkProvidelogicaladdressingwhichroutersuseforpathdeterminationEncapsulatingDataTr

7、ansportDataLinkPhysicalNetworkUpperLayerDataUpperLayerDataTCPHeaderDataIPHeaderDataLLCHeader0101110101001000010DataMACHeaderPresentationApplicationSessionSegmentPacketBitsFramePDUFCSFCSProtocoldataunitsUpperLayerDataDe-encapsulati