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The traditional way of allocating a single channel among multiple competing users is to chop up its (1) by using one of the multiplexing schemes such as FDM (Frequency
Division Multiplexing). If there are N users, the bandwidth is divided into N equal-sized portions, with each user being assigned one portion. Since each user has a private frequency (2), there is no interference among users.When there is only a small and constant number of users, each of which has a steady stream or a he
下述任务中,不属于软件工程需求分析阶段的是 ( ) 。
A、分析软件系统的数据要求
B、确定软件系统的功能需求
C、确定软件系统的性能要求
D、确定软件系统的运行平台
嗅探器可以使网络接口处于杂收模式,在这种模式下,网络接口 ( ) 。
A、只能够响应与本地网络接口硬件地址相匹配的数据帧
B、只能够响应本网段的广播数据帧
C、只能响应组播信息
D、能够响应流经网络接口的所有数据帧
若某计算机系统由两个部件串联构成,其中一个部件的失效率为7×10-6/小时,若不考虑其他因素的影响,并要求计算机系统的平均故障间隔时间为105小时,则另一个部件的失效率应为 ( ) /小时。
A. A
B. B
C. C
D. D