选择重复 (Selective Repeat) 发送点连续发送数据包但对每个数据包都设有个一个计时器。 当在一定时间内没有受到某个数据包的ACK时，发送点只重新发送那个没有ACK的数据包 这个方法的缺点是接收点收到的数据包的顺序可能不是发送的数据包顺序。因此在数据包里必须含有顺序字符来帮助接受点来排序。-Select the duplicate (Selective Repeat) send data packets sent straight points but each p

* This Applet was designed to be used in conjunction with * Computer Networking: A Top Down Approach * by James Kurose & Keith Ross. * Terminology and specifications are based upon their descr iption of the * Selective Repeat protocol i