单项选择题

WhatdoesUDLDstandfor？（）

A.UniDirectionalLoopDetection
B.UnspecifiedDistributionLabelDetection
C.UnifiedDistributionLabelDirection
D.UniDirectionalLinkDetection

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单项选择题

WhichstatementsistrueaboutForeignExchangeStation（FXS）portsonarouter？（）

A.theFXSinterfaceallowsananalogconnectiontobedirectedatthepublicswitchedtelephonenetwork（PSTN’s）centraloffice
B.theFXSinterfaceconnectdirectlytoastandardtelephone，faxmachine，orsililardeviceandsuppliesring，voltage，anddialtone
C.theFXSinterfaceconnectdirectlytoanIPphoneandsuppliesring，voltage，anddialtone
D.theFXSinterfaceconnectdirectlytoISDNvoicechannels

单项选择题

ATMcarriesIPandPPPinformationwithATMcells.WhatATMadaptationLayerisusedwhenanATMcellcarriesIPpacketsandPPPframes？（）

A.AAU2
B.AAL3
C.AAL4
D.AAL5