Chapter 11 Wide Area Networking Protocols

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1、网络分析与设计计算机系：李志远WideAreaNetworkingProtocolsPLANNING&DESIGNINGChooseWANservicestomeetcustomerrequirementsIMPLEMENTATION&OPERATIONImplementsimpleWANprotocolsTROUBLESHOOTINGPerformsimpleWANtroubleshootingTECHNOLOGYEvaluatekeycharacteristicsofWANsDefiningWANTermsCustomerpremisesequipme

2、nt(CPE)Customerpremisesequipment(CPE)isequipmentthat’sownedbythesubscriberandlocatedonthesubscriber’spremises.DemarcationpointThedemarcationlocationisthespotwheretheserviceprovider’sresponsibilityendsandtheCPEbegins.LocalloopThelocalloopconnectsthedemarctotheclosestswitchingoffice

3、,calledacentraloffice.Centraloffice(CO)Thispointconnectsthecustomerstotheprovider’sswitchingnetwork.TollnetworkThetollnetworkisatrunklineinsideaWANprovider’snetwork.ThisnetworkisacollectionofswitchesandfacilitiesownedbytheISP.WANConnectionTypesWANSupportCiscosupportsprettymuchever

4、yWANserviceavailable,andyoucanseethiswiththeencapsulation?commandfromanyserialinterface：FrameRelayISDNLAPBLAPDHDLCPPPATMPoint-to-PointProtocol(PPP)Point-to-PointProtocol(PPP)isaDataLinklayerprotocolthatcanbeusedovereitherasynchronousserial(dial-up)orsynchronousserial(ISDN)media.It

5、usestheLCP(LinkControlProtocol)tobuildandmaintaindata-linkconnections.NetworkControlProtocol(NCP)isusedtoallowmultipleNetworklayerprotocols(routedprotocols)tobeusedonapoint-to-pointconnection.LinkControlProtocol(LCP)ConfigurationOptionsAuthenticationThisoptiontellsthecallingsideof

6、thelinktosendinformationthatcanidentifytheuser.ThetwomethodsarePAPandCHAP.CompressionThisisusedtoincreasethethroughputofPPPconnectionsbycompressingthedataorpayloadpriortotransmission.PPPdecompressesthedataframeonthereceivingend.ErrordetectionPPPusesQualityandMagicNumberoptionstoen

7、sureareliable,loop-freedatalink.MultilinkStartinginIOSversion11.1,multilinkissupportedonPPPlinkswithCiscorouters.PPPcallbackPPPcanbeconfiguredtocallbackaftersuccessfulauthentication.PPPSessionEstablishmentPPPAuthenticationMethodsPasswordAuthenticationProtocol(PAP)ChallengeHandshak

8、eAuthenticationProtocol(CHAP)PAPP