单项选择题

InanL2TPvoluntarytunnelingscenario，theVPDNtunnelisterminatedbetween：（）

A.TheclientandtheNAS.
B.TheNASandtheLNS.
C.TheNASandtheLAC.
D.TheclientandtheLNS.

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InwhatwaydoesCiscoSMARTnethelpcustomersprotecttheirnetworkinvestments？（）

A.allowsthemtoacquirereplacementhardwareasneededinsteadofcarryingitininventory
B.includesupgradeinsurance
C.includesCiscoLearningCreditsforstafftraining
D.providesthemwithtrade-inincentivesfortheirend-of-lifeproducts

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Youaretroubleshootingaone－waycallproblemwithacisco7920wirelessipphoneonastandalonewlan.Whatmaycausethisproblem？（）

A.theminimumdatarateisnotsetto11mbps.
B.anaddressresolutionprotocolhasbeendisabled
C.publiclysecurepacketforwardingisenabled
D.theaccesspointissettotheleastcongestedchannel.