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随着计算机技术的发展与普及，计算机网络技术也得到了很大的提高。特别是２０世纪９０年代，由于世界各大网络公司进入国内市场，形成了各种各样的异构网络系统，有些单位甚至出现几个异构网络系统（ＵＮＩＸ，Ｎｅｔｗａｒｅ，ＷｉｎｄｏｗｓＮＴ）并存的格局，如何在保护现
With the development and popularization of computer technology, computer network technology has also been greatly improved. Especially in the 1990s, as all major internet companies in the world entered the domestic market, a variety of heterogeneous network systems were formed. Some units even had several coexisting patterns of heterogeneous network systems (UNIX, Netware and WindowsNT) How to protect now