ns2网络仿真实验。在ns2环境下，利用CMU配置随机节点及cbr数据流，并使用gawk分析结果。虽是个比较基础的实验，但诸多网络仿真实验（黑洞，虫洞，协议移植）均是基于此实验之上的。-A ns2 network simulation experiment. Under ns2 environment, the principle of the experiment is configuring random nodes and cbr data stream by using CMU and using gawk to analyze the result. Although it is a relatively basic experiment, many network simulation experiments are based on this experiment.