这些协议都不支持国际化，都使用明文传递口令，都不容易扩展。
None of these protocols allowed for internationalization, all sent passwords in plain text, and none of them were easily extensible.
在使用telnet这样的不安全“明文”协议时，网络上的任何人都可以窃取您的密码和其他敏感信息。
When using an unsecured, "clear text" protocol such as Telnet, anyone on the network can pilfer your passwords and other sensitive information.
PAP（Password Authentication Protocol，密码验证协议，与 PPP 一起使用，在此机制下，密码以明文形式被发送到客户机进行比较）；
PAP (Password Authentication Protocol, used with PPP in which the password is sent to the client as clear text for comparison);
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