The paper mainly introduces the components and the related technology of network security access control system and explores the application of this technology on railway information system.

主要介绍网络安全准入控制系统组成及相关技术，并对该技术在铁路信息系统中如何应用加以探讨。

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These actions can be security configuration changes, key and certificate management, access control policy changes, bus and other system resources management, and so on.

这些操作可以是安全配置更改、密钥和证书管理、访问控制策略更改、总线和其他系统资源管理等等。

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The system must provide security and control access to those functions based on permissions.

系统必须提供安全性，并根据相应的权限控制对这些功能的访问。

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Sendmail's new NT 3.0 product provides NT administrators with security features, like header scanning, relay access control, and better defenses against theoretical attacks, to which Unix and Linux system administrators are already accustomed.

CNN: Sendmail brings open source technology from Unix to NT