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1、思科CCNA復習與案例應用ByKenChen CCIE#12101層級網(wǎng)絡結(jié)構(gòu)的定義NetworkStructureDefinedbyHierarchyDistributionLayerCoreLayerAccessLayerOSIModelOverviewDataFlowLayersTransportLayerDataLinkNetworkLayerPhysicalApplication(Upper)LayersSessionPresentationApplication應用層數(shù)據(jù)流層數(shù)據(jù)封裝(Enca
2、psulatingData)TransportDataLinkPhysicalNetworkUpperLayerDataUpperLayerDataTCPHeaderDataIPHeaderDataLLCHeader0101110101001000010DataMACHeaderPresentationApplicationSessionSegmentPacketBitsFramePDUFCSFCS發(fā)送端UpperLayerData數(shù)據(jù)解封裝(De-encapsulatingData)LLCHdr+IP+
3、TCP+UpperLayerDataMACHeaderIP+TCP+UpperLayerDataLLCHeaderTCP+UpperLayerDataIPHeaderUpperLayerDataTCPHeader0101110101001000010TransportDataLinkPhysicalNetworkPresentationApplicationSession接收端點到點的通訊過程Peer-to-PeerCommunicationIP地址分類IPAddressClasses路由模式的概述Ove
4、rviewofRouterModes配置串行接口ConfiguringaSerialInterface進入全局配置模式EnterGlobalConfigurationModeRouter(config-if)#clockrate64000Router(config-if)#Router(config)#interfaceserial0Router(config-if)#Router#configureterminalRouter(config)#Router(config-if)#bandwidth64R
5、outer(config-if)#exitRouter(config)#exitRouter#進入接口(SpecifyInterface)在DCE端設(shè)置時鐘率SetClockRate (onDCEinterfacesonly)設(shè)置帶寬SetBandwidth (recommended)接口狀態(tài)解釋InterpretingtheInterfaceStatus不同interface問題的原因與解決思路Serial1isadministrativelydown,Lineprotocolisdown沒有使用nos
6、hutdown命令激活端口，進入接口下使用noshutdownSerial1isdown,Lineprotocolisdown 1.對方接口沒有用noshutdown激活端口2.對方設(shè)備沒有開機3.線路損壞,接口沒有連接線纜或線纜沒有接好Serial1isup,lineprotocolisdown 1.沒有配置相同的二層協(xié)議,serial接口defaultencapsulation:HDLC 2.可能沒有配置時鐘頻率Serial1isup,lineprotocolisup接口工作正常SerialInter
7、faceshowcontrollerCommandRouter#showcontrollerserial0HDunit0,idb=0x121C04,driverstructureat0x127078buffersize1524HDunit0,V.35DTEcable...顯示serial接口連線類型V.35DTECableshowanddebugCommandsProcessingcharacteristicProcessingloadPrimaryuseshowStaticLowoverheadGath
8、erfactsdebugDynamicHighoverheadObserveprocesses管理思科IOS文件ManagingCiscoIOSImages思科IOS挎貝命令CiscoIOScopyCommandNVRAMTerminalTFTPserverErasestartEthernetSwitchesandBridges地址學習(Addresslearning)轉(zhuǎn)發(fā)/過濾決定(Forward/filterdecisio
