提出了一种采用树形层次结构的分布式网络安全系统管理模型。

A management model of distributed network security system with tree-like hierarchical structure was introduced.

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最后，介绍了由系统管理学派提出的，经营管理的层次结构体系，并对其进行了展开和讨论。

At last, a new system of "administrative level structure," which is proposed by the school of system management is introduced and expounded.

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本书语言简洁，层次清晰，是UNIX系统管理员的必备参考书。

The book succinct language, the level of clear and UNIX system administrator is an essential reference books.

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