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The purpose of a network（ ）is to provide a shell around the network which will protect the system connected to the network from various threats.
A. firewall
B.switch
C. router
D. gateway
B.switch
C. router
D. gateway
参考答案
参考解析
解析：网络防火墙的任务是提供一个网络保护壳，保护系统连接网络的时候不受到各种各种的威胁
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