(75) is a mechanism used for protecting the users outside of network from accessing some non-authorized computer resources.

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问题 (75) is a mechanism used for protecting the users outside of network from accessing some non-authorized computer resources.

选项 A、Network Card
B、Protocol
C、firewall
D、Router

答案C

解析 防火墙是一种机制,用来防止用户从外部网络访问一些未经授权的计算机资源。
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