【名词&注释】
恢复时间(recovery time)、主要特点(main features)、蒙特卡洛法(monte carlo method)、视频文件格式(video file format)
[单选题]某公司在测试灾难恢复计划时是发现恢复业务运营所必要的关键数据没有被保留,可能由于什么没有明确导致的?
A. 服务中断的时间间隔
B. 目标恢复时间(RTO)
C. 服务交付目标
D. 目标恢复点(RPO)
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举一反三：
[单选题]●用户需求在项目开始时定义不清，开发过程密切依赖用户的良好配合，动态响应用户的需求，通过反复修改来实现用户的最终系统需求，这是(7)的主要特点。(7)
A. 蒙特卡洛法
B. 原型法
C. 面向对象方法
D. 头脑风暴法
[多选题]●Let us now see how randomization is done when a collision occurs.After a(71),time is divided into discrete slots whose length is equal to the worst-case round-trip propagation time on the ether(2τ). To accommodate the longest path allowed by Ethernet, the slot time has been set t0 512 bit times, or 51.2μsec.After the first collision, each station waits either 0 or l (72) times before trying again. If two stations collide and each one picks the same random number, they will collide again. After the second collision, each one picks either 0,1,2,or 3 at random and waits that number of slot times. If a third collision occurs (the probability of this happening is 0.25), then the next time the number of slots to wait is chosen at (73) from the interval 0 to 23-1.
A. In general, after i collisions,a random number between 0 and 2i-1 is chosen, and that number of slots is skipped. However, after ten collisions have been reached, the randomization (74) is frozen at a maximum of 1023 slots. After 16 collisions, the controller throws in the towel and reports failure back to the computer. Further recoveryis up to (75 )layers.
B. datagram
C. collision
D. connection
E. service
F. slot
G. switch
H. process
I. fire
J. rest
K. random
L. once
M. odds
N. unicast
O. multicast
P. broadcast
Q. interval
R. local
S. next
T. higher
U. lower
[单选题]高级加密标准AES算法中，加密回合数不可能是()。
A. 10
B. 12
C. 14
D. 16
[多选题]视频文件由于比较大，常需要压缩存储，以下视频文件格式(video file format)______并没有指定压缩标准。
A. GIF
B. AVI
C. MPEG
D. RealVideo
F.
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