下列关于防火墙的叙述中,错误的是
A.防火墙可以防止内网信息外泄
B.符合安全策略的数据流才能通过防火墙
C.防火墙可以对网络存取和访问进行监控
D.防火墙只对外部进入内网的通信进行过滤
正确答案是D
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