图1和图2展示如何使用一个像Wireshark这样的网络嗅探程序轻松让任何人随意查看telnet会话。

Figure 1 and Figure 2 show how easily a Telnet session can be casually viewed by anyone on the network using a network-sniffing application such as Wireshark.

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对于控制解析器的应用程序而言，一次循环是必要的，因为应用程序很容易在嗅探前面几行之后停止读入。

For those applications controlling the parser, a loop helps because the application can easily stop the reading after sniffing the first few lines.

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这样，在必要时，您就可以很容易地运行未加密的程序，当您想要“嗅探”网络，看看到底有什么东西正在通过网络时，这一点很有用。

Thus, you can easily run your program without encryption when necessary, which can be useful when you want to "sniff" the network to see what is actually traversing the wire.

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