如果发送窗口为W s ,接收窗口为Wr,对于回退N步(Go-Back-N,GBN)协议,则有
A.W s =1,W r =1
B.W s >1, W r >1
C.W s ≥1, W r =1
D.W s ≥1, W r >1
正确答案是C
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