软件水平考试网络工程师英语复习练习题6套

第6套
In ATM,cells serve as universal units for all information  types:data,voice,video,etc,Since switches know beforehand the size  and format of each information unit sent through the network,switch  architectures can be 1),Futhermore ,since the CMS determines the  connection path during connection setup,switches do not have to make  complex 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 machines  and ,in the future,optical switching techniques,can be applied to  switches.Hardware Based switch matrices take advantage of all these (3) characteristics.The matrix approach to implementing cell  switching greatly increases the scalability of ATM based  solutions,One fundamental advantage of matrix based switches is  that,as more ports are added to the switching complex,the aggregate  switching capacity of the switch increases. In other words, as(4)  are added to a switched network, they tap into an increasing band  width pool-the complete opposite of shared media networks,where user  are forced to share smaller and smaller slices of a fixed amount of (5).Simply put,cell switching based on ATM enables extremely  fast,massively scalable networdks.  
 (1) A.optimized    B.increased       C.decreased  D.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.bandwidth  D.information 
答案:1:A,2:A,3:D,4:C,5:C