网络技术的发展使得网络安全问题变得更为严重。因此,掌握网络监听技术就显得尤为重要。文中阐述了基于以太网和交换环境下的网络监听技术的基本原理,并介绍了常用的网络监听工具,探讨了检测和防止网络监听的技术。 The development of network technology makes the problem of network security more serious. Therefore, to master the network monitoring technology is particularly important. This paper describes the basic principles of network monitoring technology based on Ethernet and switching environment, and introduces the commonly used network monitoring tools, discusses the detection and prevention of network monitoring technology.