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[单选] A(n)()is a system composed of hardware,software,or both that is designed to detect intrusion and prevent unauthorized access to or from a private network.()是一个由硬件、软件或两者组成的系统,旨在检测入侵并防止未经授权访问或从专用网络访问()
A.A)encryption加密 B.B)firewall防火墙 C.C)alarm报警 D.D)logic bomb逻辑炸弹 选择题三
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