2012年软件水平网络工程师考试英语考前冲刺题（6）
In ATM,cells serve as universal units for all informationtypes:data,voice,video,etc,Since switches know beforehand the sizeand format of each information unit sent through the network,switcharchitectures can be 1),Futhermore ,since the CMS determines theconnection path during connection setup,switches do not have to makecomplex routing decisions on a (2) basis.Communiciation paths can be“hard wired” into the switch’s circuits to enable fast,simple decisions. Hardware techniques,using VLSI based state machinesand ,in the future,optical switching techniques,can be applied toswitches.Hardware Based switch matrices take advantage of all these (3) characteristics.The matrix approach to implementing cellswitching greatly increases the scalability of ATM basedsolutions,One fundamental advantage of matrix based switches isthat,as more ports are added to the switching complex,the aggregateswitching capacity of the switch increases. In other words, as(4)are added to a switched network, they tap into an increasing bandwidth pool-the complete opposite of shared media networks,where userare forced to share smaller and smaller slices of a fixed amount of (5).Simply put,cell switching based on ATM enables extremelyfast,massively scalable networdks. (1) A.optimized B.increased C.decreasedD.fixed(2) A.cell by cell B.object oriented C.bit-by-bit D.LAN
(3) A.VLSI B.OSI C.CMS D.ATM
(4) A.cells B.switches C.users D.approaches
(5) A.data B.media C.bandwidthD.information
答案:1:A,2:A,3:D,4:C,5:C
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