根据美国国防部和国家标准局的《可信计算机系统评测标准》，标记

【名词&注释】

应用软件(application software)、因特网(internet)、子网掩码(subnet mask)、安全级别(security level)、开窗口(windowing)、可信计算机(trusted computer)、美国国防部(us department)、标识符(identifier)、统计时分复用(statistical time division multiplexing)

[单选题]根据美国国防部^{(us department)}和国家标准局的《可信计算机系统评测标准》，标记安全保护的安全级别为______。

A. A1
B. B1
C. B2
D. B3

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学习资料：

[单选题]●设备 (20) 程序通常是需要时自动启动，运行在后台，不打开窗口，并用来在外设与计算机之间建立通信的软件。(20)

A. 测试
B. 诊断
C. 驱动
D. 控制

[单选题]一个B类网络的子网掩码为255.255.192.0，则这个网络被划分成了(52)个子网。

A. 2
B. 4
C. 6
D. 8

[单选题]Frame. Relay is simplified form. of(71), similar in principle to(72), in which synchronous, frames of data are routed to different destinations depending on header information.Packets are routed throught one or more Virtual Circuits known as(73)Most Virtual Circuits are(74), which means that the network provider sets up all DLCI connections at subscription time.(75)are also part of the Frame. Relay specification. They privide a link that only lasts only as long as the session.

A. Datagram Switching
B. Datagram Routing
C. Packet Switchig
D. packet Routing

[单选题]

B． -11 C． -8 D． O

A. -18B． -11
B. -8
C. O

[多选题]8个64 kbps的信道通过统计时分复用^{(statistical time division multiplexing)}到一条主干线路，如果该线路的利用率为80%，则其带宽应该是 ______ kbps。

A. 410
B. 512
C. 640
D. 1440
G.

[单选题]用户标识符^(identifier)是指用户的(56)。

A. 姓名
B. 入网账号
C. IP地
D. 入网密码

[单选题]______ is permanently stored in the computer and provides a link between the hardware and other programs that run on the PC.

A. Interface
B. Operating system
C. Internet
D. Applicaion software

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