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【单选题】
由于ICMP消息没有目的端口和源端口，而只有消息类型代码。通常过滤系统基于（）来过滤ICMP数据包A.
端口
B.
IP地址
C.
消息类型
D.
代码
E.
状态
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【单选题】企业内部网是采用 TCP/IP 技术，集 LAN 、WAN 和数据服务为一体的一种网络，它也称为()。
A.
广域网
B.
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C.
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D.
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