题目：
防火墙在网络安全中起着重要的作用，但是防火墙也有自己的局限性，它很难防范来自于（）的攻击和（）的威胁。
A.网络内部
B.网络外部
C.入侵检测系统
D.病毒系统
E.漏洞扫描系统
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A
防火墙在网络安全中起着重要的作用，但是防火墙也有自己的局限性，它很难防范来自于（）的
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