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WhicharethreeadvantagesofPPPoAimplementation?()

A.NAPandNSPprovidesecureaccesstocorporategatewayswithoutmanagingend-to-endPVCs.NAPandNSPuseLayer3routing，Layer2Forwarding，orLayer2TunnelingProtocoltunnels.Hence，theycanscaletheirbusinessmodelsforsellingwholesaleservice

B.TheNSPcanoversubscribebydeployingidleandsessiontimeoutsusinganindustrystandard RADIUSserverforeachsubscriber

C.OnlyasinglesessionperCPEononevirtualchannel （VC).Theusernameandpasswordare configuredontheCPE，soallusersbehindtheCPEforthatparticularVCcanaccessonlyonesetofservices.Userscannotselectdifferentsetsofservices，althoughusingmultipleVCsandestablishing differentPPPsessionondifferentVCsispossible

D.IfasingleIPaddressisprovidedtotheCPE，andNATorPATisimplemented，certain applications suchasIPTV，whichembedIPinformationinthepayload，wellnotwork.Additionally，ifanIP subnet featureisused，anIPaddressalsohastobereservedfortheCPE

E.PPPoAcanusethefeaturesontheCiscoServiceSelectionGateway（SSG）

参考答案

更多 “ WhicharethreeadvantagesofPPPoAimplementation?() A.NAPandNSPprovidesecureaccesstocorporategatewayswithoutmanagingend-to-endPVCs.NAPandNSPuseLayer3routing，Layer2Forwarding，orLayer2TunnelingProtocoltunnels.Hence，theycanscaletheirbusinessmodelsforsellingwholesaleserviceB.TheNSPcanoversubscribebydeployingidleandsessiontimeoutsusinganindustrystandard RADIUSserverforeachsubscriberC.OnlyasinglesessionperCPEononevirtualchannel （VC).Theusernameandpasswordare configuredontheCPE，soallusersbehindtheCPEforthatparticularVCcanaccessonlyonesetofservices.Userscannotselectdifferentsetsofservices，althoughusingmultipleVCsandestablishing differentPPPsessionondifferentVCsispossibleD.IfasingleIPaddressisprovidedtotheCPE，andNATorPATisimplemented，certain applications suchasIPTV，whichembedIPinformationinthepayload，wellnotwork.Additionally，ifanIP subnet featureisused，anIPaddressalsohastobereservedfortheCPEE.PPPoAcanusethefeaturesontheCiscoServiceSelectionGateway（SSG） ” 相关考题
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