【名词&注释】
网络安全(network security)、数字签名(digital signature)、防火墙、基本概念(basic concept)、数字证书(digital certificate)、民间团体(civil organization)、政府机构(government organization)
[多选题]以下不属于网络安全控制技术的是()
A. 防火墙技术
B. 访问控制
C. 入侵检测技术
D. 差错控制
查看答案&解析
举一反三：
[单选题]下列关于CA(认证中心)的说法中错误的是(8)。
A. CA负责数字证书的审批、发放、归档、撤销等功能
B. 除了CA本身，没有其他机构能够改动数字证书而不被发觉
C. CA可以是民间团体(civil organization)，也可以是政府机构(government organization)
D. 如果A和B之间相互进行安全通信必须使用同一CA颁发的数字证书
[多选题]●In the following essay，each blank has four choices．Choose the best answer and write down on the answer sheet．Spread spectrum simply means that data is sent in (66) pieces over a number of the discrete frequencies available for use at any time in the specified range．Devices using (67) spread spectrum(DSSS)communicate by splitting each (68) of data into several parts and sending them concurrently on different (69) ,DSSS uses a lot of the available (70) ，about 22 megahertz(MHz)．
A. small
B. high
C. low
D. long
E. direct-sequence
F. discrete-sequence
G. duplicate-sequence
H. dedicate-sequence
I. data
J. byte
K. packet
L. bit
M. bits
N. frequencies
O. packets
P. messages
Q. rate
R. velocity
S. bandwidth
T. period
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