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2020-06-10

ping网络协议

ping 没有指定端口这个选项吧,他是网络层的,端口可是传输层的概念啊。

Ping程序使用的是ICMP协议,ICMP不像http,FTP应用层有传输层的端口号,(它们使用TCP的端口号80和20/21)。ICMP直接封装在IP包内

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