ccna 第十一章建立串行的点对点连接

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1、第十一章建立串行的点对点连接通过本章的学习，您应该掌握以下内容：在广域网的串行口上配置HDLC和PPP协议在一个PPP连接内配置PAP和CHAP验证查看点到点的HDLC和PPP协议配置情况本章目标WAN概述ServiceProvider广域网连接的场所根据用户不同的需求提供不同的连接方案专线同步串口TelephoneCompany电路交换异步串口ServiceProvider包交换同步串口广域网连接类型:物理层Point-to-pointorcircuit-switchedconnectionCOSwitchCustomerPremisesEquipmentDemarcationLoc

2、alLoopWANserviceprovidertollnetworkTrunksandswitches广域网的服务提供服务商给用户分配线路的参数SSSSSSSRouterconnectionsNetworkconnectionsattheCSU/DSUEIA/TIA-232EIA/TIA-449EIA-530V.35X.21CSU/DSUEnduserdeviceServiceProviderDTEDCEPPP的串口连接专线包交换PPP,SLIP,HDLCHDLC,PPP,SLIP电路交换X.25,FrameRelay,ATM广域网连接类型:数据链路层TelephoneCompanySer

3、viceProviderFlagAddressControlDataFCSFlagHDLC支持单一的协议环境FlagAddressControlProprietaryDataFCSFlagCiscoHDLCHDLC帧格式Cisco的HDLC具有proprietary字节提供对多协议环境的支持HDLC命令Router(config-if)#encapsulationhdlc启用HDLC封装HDLC是同步串口的缺省封装格式PPPEncapsulationTCP/IPNovellIPXAppleTalkMultipleprotocolencapsulationsusingNCPsinPPPPPP

4、可以通过NCP携带多个协议的数据包PPP可以通过LCP建立和控制连接LinksetupandcontrolusingLCPinPPPPPP综述SynchronousorAsynchronousPhysicalMediaLinkControlProtocolAuthentication,otheroptionsNetworkControlProtocolPPPDataLinkLayerPhysicalLayerNetworkLayerIPCPIPXCPManyOthersIPIPXLayer3ProtocolsPPP分层结构PPP—Adatalinkwithnetwork-layerservi

5、cesFeatureHowItOperatesProtocolAuthenticationPAPCHAPPerformChallengeHandshakeRequireapasswordCompressionCompressdataatsource;reproducedataatdestinationStackerorPredictorErrorDetectionAvoidframeloopingMonitordatadroppedonlinkMagicNumberMultilinkLoadbalancingacrossmultiplelinksMultilinkProtocol(M

6、P)PPPLCP配置选项PPP验证概述两种PPP验证协议:PAP和CHAPPPP会话的建立1链路建立2验证阶段3网路层协议连接DialuporCircuit-SwitchedNetwork密码明文传输验证两端是同等的选择PPP验证协议RemoteRouter(SantaCruz)Central-SiteRouter(HQ)Hostname:santacruzPassword:boardwalkusernamesantacruzpasswordboardwalkPAP2-WayHandshake“santacruz,boardwalk”Accept/Reject选择PPP验证协议Remo

7、teRouter(SantaCruz)Central-SiteRouter(HQ)Hostname:santacruzPassword:boardwalkusernamesantacruzpasswordboardwalkCHAP3-WayHandshakeChallengeResponseAccept/Reject密码是加密的ü配置PPP验证总述ServiceProviderVerifywh