【名词&注释】
数字签名(digital signature)、真实性(authenticity)、一对一(one to one)、帧中继(frame relay)、一部分(part)、报文交换(message exchange)、提供者(provider)、循环体(loop body)、死循环(endless loop)
[单选题]主体是引起()在客体之间流动的人、进程或设备等。
A. 数据
B. 程序
C. 资讯
D. 信息
查看答案&解析
举一反三：
[单选题]● 下面的一段C 程序中，循环体(loop body)语句 （59） 退出循环。unsigned char size;
A. int aa;
B. size = 100；
C. while (size-- >= 0) {
D. aa += size;
E. }
F. 执行100次后
G. 执行101次后
H. 执行99次后
I. 死循环(endless loop)，不会
[单选题]
B． 一对多
C． 顺序
D． 层次
A. 一对一B． 一对多
B. 顺序
C. 层次
[单选题]下列不能用数字签名技术解决的是(65)。
A. 窃听
B. 伪造
C. 篡改
D. 抵赖
[单选题]文中（ 2 ）处正确的答案是（ ）。
A. 0.416
B. 0.464
C. 0.752
D. 0.438
[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．(71)
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
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