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软题库参考答案：B（仅供参考）
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Without proper safeguards, every part of a network is vulnerable to a security breach or unauthorized activity from （1）, competitors, or even employees. Many of the organizations that manage their own （2） network security and use the Internet for more than just sending/receiving e-mails experience a network （3）— and more than half of these companies do not even know they were attacked. Smaller （4） are often complacent, having gained a false sense of security. They usually react to the last v
第56题：网络系统设计过程中，逻辑网络设计阶段的任务是（ ）。 通过正交幅度调制技术把 ASK 和 PSK 两种调制模式结合起来组成 16 种不同的码元，这时数据速率是码元速率的（ ）倍。
A．2
B．4
C．8
D．16