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
正确答案及解析
正确答案
解析
网络防火墙（network firewall）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的威胁，因此选项A正确。
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