
【名词&注释】
显示器(display)、目的地(destination)、执行时间(execution time)、帧中继(frame relay)、流水线方式(pipeline mode)、显示卡(display card)、报文交换(message exchange)
[单选题]显示卡(display card)是( )之间的接口电路。
A. 主机和显示器
B. 总线和显示器
C. 内存和显示器
D. 主板和显示器
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[多选题]●Frame. Relay is simplified form. of (71) ,similar in principle to (72) ,in which synchronous,frames of data are routed to different destinations depending on header information.Packets are routed throught one or more Virtual Circuits known as (73) .Most Virtual Circuits are (74) ,which means that the network provider sets up all DLCI connections at subscription time. (75) are also part of the Frame. Relay specification.They privide a link that only lasts only as long as the session.
A. Datagram Switching
B. Datagram Routing
C. Packet Switching
D. packet Routing
E. X.21
F. X.25
G. X.28
H. X.29
I. DLCIs
J. HDLCs
K. SDLCs
L. DLs
M. Permanent Circuits
N. Permanent Virtual Circuits
O. Switched Virtual Circuits
P. Switching Circuits
Q. Permanent Circuits
R. Permanent Virtual Circuits
S. Switched Virtual Circuits
T. Switched Circuits
[单选题]若每一条指令都可以分解为取指,分析和执行三步。已知取指时间t取指=8t,分析时间t分析=3t,执行时间t执行=12t。如果按照流水线方式执行指令,从头到尾执行完 100条指令至少需(41) t。如果取指时间t取指=8t,分析时间t分析=12t,执行时间 t执行=3t,则从头到尾执行完100条指令至少需(42)t。
A. 1200
B. 1223
C. 1224
D. 1211
[单选题]考查文法:G(VT,VN,E,P)其中,VT={+,*,(,),i},VN={E,T,F},E为开始符。
A. P:E→E+T|T
B. T→T*F|P
C. |i
D. F*F+T是该文法的一个句型,在此句型中,(27)是句柄,(28)是该句型的直接推导,(29)该句型的最左推导。
E. F
F. F*F
G. F+T
H. F*F+T
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