防火墙用于将 Internet 和内部网络隔离___。

A、是防止Internet火灾的硬件设施
B、是网络安全和信息安全的软件和硬件设施
C、是保护线路不受破坏的软件和硬件设施
D、是起抗电磁干扰作用的硬件设施
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正确答案:

B

答案解析:

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