正如我们在第一章所学的，端到端时延中最为复杂和有趣的成分就是排队时延。在这个程序中，可以设置分组发送速率和链路传输速率，你将会看到分组到达和为接受服务而排队。当队列变满时，将会发生分组溢出，也就是丢包-As we learned in the first chapter, end to end delay of the most complex and interesting elements is the queuing delay. In this program, you can set the packet sending rate and link transmission rate, you will see the packet arrival and queue for receiving services. When the queue becomes full, the overflow will occur grouping, that is, loss