若甲乙双方采用GBN协议发送报 文 且 甲已发送了0-7号报文段,当计时器超时时甲只收到0、2、4号报文段的确认,则甲需要重发的报文段为
A.0~7号报文段
B.2~7号报文段
C.5~7号报文段
D.1、3和5-7号报文段
正确答案是C
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