滑动窗口协议仿真,程序按照滑动窗口协议实现端对端的数据传送。包括协议的各种策略，如包丢失、停等应答、超时等都应有所仿真实现-The sliding window protocol simulation program, in accordance with the sliding window protocol implementation end-to-end data transmission. Including all kinds of strategies of the agreement, such as packet loss and stop response, timeout should be implemented