单项选择题
What is true regarding Cisco Network Registrar in Cable networks？（）
A.It provides comprehensive Domain Name system B.It provides DHCP administrative functionality C.It provides TFTP server functionality. D.All of the above are true
单项选择题 WhatdoesUDLDstandfor？（）
单项选择题 WhatwillsignificantlydegradeDSLperformance，regardlessofDSLrateorlinelength？（）
单项选择题 ATMcarriesIPandPPPinformationwithATMcells.WhatATMadaptationLayerisusedwhenanATMcellcarriesIPpacketsandPPPframes？（）
