(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 本题主要考查“防火墙”。Network Card 意为“网卡”;protocol 意为“协议”;Firewall 意为“防火墙”;Router 意为”路由器”。所以答案为C。
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