... 2.单帧滑动窗口与停止-等待协议：不论是否已有该分组，收到就确认、超时重传、分组和ack有编号。 3.多帧滑动窗口与后退N帧协议（GBN也称滑动窗口协议）：丢弃失序分组（使接受缓存简单）：序号、检查、累积确认、超时/重传。 4.
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GBN's fashionable associates work essentially for nothing: their reward is to have access to the network and its publications.
ECONOMIST: A perfect day
GBN's clients also provide the company with feedback that it can then repackage.
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