tcpdump工具是一个比较老的工具，它从网上“嗅探”网络数据包，打印到stdout或记录在一个文件中。
The tcpdump tool is an older tool that "sniffs" network packets from a network and either prints them to stdout or logs them to a file.
大多数的网络嗅探器也能够解码和解密特定的数据包内容，这能够帮助您研究一个已知协议的内容。
Most of the network sniffers will also decode and decipher specific packet contents, which will help you when you want to study the content of a recognized protocol.
另外，随着现代网络环境中交换机的大量使用，传统的网络嗅探器不能再监听到在其它主机之间来回传递的数据包。
Besides, with the rapid use of switches in modern network circumstances, the previously used network sniffer programs can not detect the data traffic between other hosts.
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