单项选择题

KAL－APontheCiscoACEallowscommunicationwithCiscoACEGlobalSiteSelector，toreportvirtualIPandrealserveravailability.WhichstatementistrueaboutKAL－AP？（）

A.ItisaCiscoproprietykeepalive.
B.Itsupportsamaximumof256KAL-APentries.
C.Itsupportsamaximumof256KAL-APkeepalives.
D.ItisusedforbothCiscoandnon-ciscoloadbalancers.

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问答题

有一个16K×16位的存储器，由1K×4位的DRAM芯片构成(芯片是64×64结构)。问：(1)共需要多少RAM芯片?(2)采用异步刷新方式，如单元刷新间隔不超过2ms，则刷新信号周期是多少(3)如采用集中刷新方式，存储器刷新一遍最少用多少读／写周期?死时间率是多少?

单项选择题

WhatistheeffectofturningonallavailabledownstreamcarriertonesinaDMTDSLtransmissionsystems？（）

A.DownstreamRSerrorcorrectioneffectivenessisreduced
B.Thedownstreamlinerateandthroughputremainsunchanged，butFECefficiencyisreduced
C.TheupstreamDSLbandwidthisreduced，sincelesscarriersbecomeavailableforupstreamtraffic
D.ThedownstreamDSLbandwidthisincreased