引言 随着计算机网络的不断发展,全球信息化已成为人类发展的大趋势。但由于网络具有开放性、互连性等特征,致使网络易受黑客、怪客、恶意软件和其他不轨行为的攻击,尤其政府的信息资源涉及大量国家机密,所以政府部门的网络建设,首尢要考虑的是安全问题。笔者参与了扬州市水利局网络的建设,现就局域网的安 INTRODUCTION With the continuous development of computer networks, the global informationization has become a general trend of human development. However, due to the characteristics of openness and interconnectivity of the network, the network is vulnerable to attacks by hackers, geeks, malware and other misdeeds. In particular, the government information resources involve a large number of state secrets. Therefore, the network construction of government departments, especially The issue to be considered is safety. I participated in Yangzhou City Water Conservancy Bureau network construction, it is LAN security