试题与答案

A () system placed between the company net

题型:单项选择题

题目:

A () system placed between the company network and the outside world may limit outside access to the internal network.

A.firewall

B.modem

C.gateway

D.key

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A

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