NIS is a part of the Network File System (NFS) software package that includes commands and daemons for NFS, NIS, and other services.

NIS是网络文件系统(Net work File System, NFS)软件包的一部分，该软件包包括用于NFS、NIS和其他服务的命令和守护进程。

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Traditionally, enabling rwhod and rusersd was seen as a wasteful use of network resources, because these daemons broadcast information over the network continually, using up bandwidth.

以前一直认为，启用 rwhod 和 rusersd 是对网络资源的浪费，因为这两个守护进程在网络中不断地广播信息，从而占用了带宽。

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Linux hosts always fill their process tables with a bunch of more-or-less simultaneous programs: network protocol daemons, cron managers, the kernel itself, and often much more.

Linux主机总是把一组或多或少同时执行的程序(网络协议守护程序、cron管理程序、内核本身，常常还有更多)填到主机的进程表中。

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In addition, you should consider avoiding plaintext-password network services: The POP3, FTP, and Telnet daemons pose a special risk because their passwords pass unencrypted across the open network, sniffable by any nearby machine along the way.

CNN: Analysis: Linux security