端口扫描技术：学习端口扫描技术基本原理，理解端口扫描技术在网络攻防中的作用。通过上机实验，熟练掌握常用的网络扫描工具的使用和端口扫描编程技术。-Port scanning techniques: Learn the basic principles of port scanning techniques, understanding the role of port scanning techniques of attack and defense in the network. Through