正确答案: D

目标恢复点(RPO)

题目：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?

解析：答案：D

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举一反三的答案和解析：

[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)

原型法

[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.

collision

service

switch

process

fire

random

once

odds

multicast

broadcast

interval

next

higher

lower

解析：B,A,B,D,C

[单选题]高级加密标准AES算法中，加密回合数不可能是()。

16

解析：答案：D

[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______并没有指定压缩标准。

AVI