中文摘要：

网络流量监测是网络安全管理的一种基本方法。文中论述了网络流量监测的SNMP技术、RMON技术和RMON2技术，分布式网络分析仪的工作原理，对网络流量监测的方法，从软件和硬件的使用、测量机制、流量监测的时间等进行了比较和分析。利用网络分析仪在实验室网络中在线实时采集和统计到的数据，如帧流量和带宽利用率、交换机端口流量、统计的通过数据包的协议类型分布状况等。通过在实验过程中不断增加网络流量，网络管理者能够直观地监测和对比各个时段的网络流量，及时排查网络故障，合理地利用网络资源，安全地管理网络。

英文摘要：

Network traffic monitoring is a basic method of network security management. It introduces the techniques of network traffic monitoring, SNMP,RMON and RMON2, and the principles of distributed network analyzer. It compares and analyzes the methods of network traffic monitoring from the use of software and hardware, the measurement mechanism and the time of traffic monitoring. Use the real-time data collected and analyzed by network analyzer in the laboratory network, such as the data of frame traffic, bandwidth uti- lization and flow switch ports, statistical packet of protocol type distribution. During the experiment, increasing the network traffic, net- work managers can monitor visually and compare various periods of network traffic, they can also easily find network failure timely, rea- sonably use network resources, and securely manage network.