说明：  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 experiments on the machine, master and port scans using programming techniques commonly used network scanning tool.)