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【多选题】
关于TCP慢启动的描述，下列正确的是（）。
A.
拥塞窗口cwnd初始设置为1，设置cwnd的最大门限为ssthresh（慢启动门限，接收方建议的值）
B.
发送端每收到一个ACK，cwnd就加倍，直到最大门限，接着就启动拥塞避免算法
C.
当发生拥塞时，就启动拥塞避免算法
D.
慢启动算法只在初始状态和重传后进行。在拥塞窗口达到慢启动门限后，该算法停止工作，转入拥塞避免算法
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【简答题】A frog (青蛙) is born in a small river．When he is young，the river is his home．He doesn’t know his parents，but he has hundreds of brothers and sisters．He swims about and plays with them all the time．At t...
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