题目内容

LZW编码是（）。

A. 有损数据压缩编码
B. 无损数据压缩编码
C. 不压缩数据的编码
D. 通道(或称信道)编码

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一个主机的IP地址是172.20.50.17对应的子网掩码是255.255.255.240，则所在的子网号是 (61) ，子网的广播地址是 (62) 。（61）处填（）。

A. 172.20.50.16
B. 172.20.50.32
C. 172.20.50.17
D. 172.20.50.31

(66) method is the use of a data processing system to represent selected behavioral (67) of a physical or abstract system. For example, the representation of air streams around airfoils at various velocities, temperatures, and air pressures with such a system.Emulation method is slightly different, it uses a data processing system to imitate another data processing system, so that the imitating system accepts the same data, executes the same programs, and achieves the same (68) as the imitated system. Emulation is usually achieved (69) hardware or firmware. In a network, for example, microcomputers might emulate terminals (70) communicate with mainframe. （66）处填（）。

Assembly
B. Simultaneity
C. Fraud
D. Simulation

ISO/IEC 9126软件质量模型由（）几个层次组成。

A. 质量、功能、过程
B. 成熟性、容错性、易恢复性
C. 质量特性、质量子特性、度量指标
D. 质量特性、时间特性、资源特性

在网络互连中，实现高层互连的设备是______。