多选题
Regarding PAR (Positive Acknowledgement and Re-transmission), which of the answer choices below are correct?（）
发布日期：2020-04-11
The source device will only retransmit lost packets on the request of the destination device.
The source device starts a timer when it sends a segment and retransmits if an acknowledgment is not received before the timer expires.
The destination device acknowledges receipt of a segment by sending a packet with a new sequence number and the ACK bit sent.
The destination device acknowledges receipt of a segment by sending a packet that indicates the next sequence number it expects.
If the destination device does not receive a segment, all segments are retransmitted.
The source device keeps a record of all segments sent and expects and acknowledgment of each.
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