求教一道计算机题目.Which of thefollowing is true about firewalls?a.It can be used to scan for vulnerabilities in a system.b.It can be either a piece of hardware or software.c.It is a passive form of intrusion detection system and it alerts n

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求教一道计算机题目.Which of thefollowing is true about firewalls?a.It can be used to scan for vulnerabilities in a system.b.It can be either a piece of hardware or software.c.It is a passive form of intrusion detection system and it alerts n
求教一道计算机题目.
Which of thefollowing is true about firewalls?
a.It can be used to scan for vulnerabilities in a system.
b.It can be either a piece of hardware or software.
c.It is a passive form of intrusion detection system and it alerts network
admistrators when abnormal traffic is detected.
d.It typically can detect encrypted threats.
答案上选的是B,那个选项C为什么不可以?C说的是什么?是杀毒软件吗?其他几项指的都是什么?

求教一道计算机题目.Which of thefollowing is true about firewalls?a.It can be used to scan for vulnerabilities in a system.b.It can be either a piece of hardware or software.c.It is a passive form of intrusion detection system and it alerts n
防火墙可以是一台专属的硬件,也可以是架设在一般硬件上的一套软件.
C项应该是主动的.

A:它可以用来扫描漏洞系统。
B:它可以是一个硬件或软件。
C:它是一个被动形式的入侵检测系统,并提醒网络管理员当异常流量检测。
D:它通常可以检测加密的威胁。

问题是:以下是真实的,关于防火墙?……我能看懂,不用翻译……那你的语文,应该。。有点儿。。。。...

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A:它可以用来扫描漏洞系统。
B:它可以是一个硬件或软件。
C:它是一个被动形式的入侵检测系统,并提醒网络管理员当异常流量检测。
D:它通常可以检测加密的威胁。

问题是:以下是真实的,关于防火墙?

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