【摘要】 给出了网络安全扫描技术的概念、分类，对其中的两种主要技术——端口扫描技术和漏洞扫描技术以及它们的原理分别进行了详细阐述，讨论了各类端口扫描技术及部分技术的实现，并针对它们的优缺点进行了比较，介绍了各种漏洞扫描技术的实现原理，指出了漏洞扫描中存在的一些问题并给出了一些完善化的建议。更多还原

【Abstract】 This paper presents the concept and the classification of network security scan, expounds two important technologies of port scan and vulnerability scan contained in network security scan and introduces their principles separately. It discusses parts of the realizations, compares the merits and shortcomings of the scan technologies in port scan. It also introduces the theories of realizations of technologies in vulnerability scan. At last it points out some problems existing in vulnerability scan and gives some suggestions for improvement.更多还原