题目内容

以太网交换机采用矩阵堆叠模式互连时，需要一个（）来连接所有的下层交换机。

A. 菊花链堆叠总线
B. 堆叠中心
C. 菊花链中心
D. 混合交换中心

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Windows系统中内置了一些用户组，其中，对计算机拥有不受限制的完全访问权的用户组是（1）；权限最低的用户组是（2）。空白（2）处应选择（）

Administrators
B. PowerUsers
C. Users
D. Guests

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（3）处应选择（）

A. systems
B. characters
C. layers
D. streams

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A. 时分多路
B. 频分多路
C. 空分多址
D. 码分多址

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