Unit3-Packet-Switching
分组交换简介网络和互联网简史(A very brief history of networking and the Internet)什么是分组交换？(What is packet switching)端到端延迟(End to End Delay)播放缓冲区(Playback Buffers)排队模型(Queue models)排队模型示例有用的队列性质分组交换的工作原理(1)分组交换的工作原理(2)分组交换：严格的优先级和流速保证分组交换：延迟保证例子小结
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