题目内容

时分多路复用是指各路信号在同一信道上占用不同的(1),无线通信中使用的CDMA是一种(2)技术。 空白(2)处应选择()

A. 时分多路
B. 频分多路
C. 空分多址
D. 码分多址

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The presentation layer is concerned with the (1) and semantics of the information exchanged between two systems. The processes in two systems are usually exchanging information in the form of character(2), numbers, and so on. The information should be changed to bit (3) before being transmitted. Because different computers use different encoding systems, the presentation layer is responsible for(4) between these different encoding methods. The presentation layer at the sender changes the information from its sender-dependent format into a common format. The presentation layer at the receiving machine changes the common format into its(5)-dependent format. 空白(4)处应选择()

A. capability
B. interoperability
C. reliability
D. dependability

某公司有1000台主机,则必须给它分配(1)个C类网络。为了使这些子网汇聚成一个超网,则指定的子网掩码应该是(2)。 空白(1)处应选择()

A. 4
B. 8
C. 16
D. 24

把4个网络220.117.34.0/23、220.117.32.0/21、220.117.16.0/22和220.117.8.0/20汇聚成一个超网,其目标地址是()。

A. 220.117.0.0/13
B. 220.117.0.0/18
C. 220.117.0.0/24
D. 220.117.8.0/20

软件合法复制品(光盘)所有人不享有()。

A. 软件著作权
B. 必要的修改权
C. 软件装机权
D. 软件备份权

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