编程模拟实现数据链路层协议中的停等协议.
用c++写的，对初学tcp ip协议的人，有很大帮助-this is a protical that implements tingdeng protical in data_link .
it is a perfact work that you can hand it to teacher .i think it is useful for the people who just start to learn the tcp ip protical . it really helps a lot
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