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多选题
Regarding PAR (Positive Acknowledgement and Re-transmission), which of the answer choices below are correct?（）
A
The source device will only retransmit lost packets on the request of the destination device.
B
The source device starts a timer when it sends a segment and retransmits if an acknowledgment is not received before the timer expires.
C
The destination device acknowledges receipt of a segment by sending a packet with a new sequence number and the ACK bit sent.
D
The destination device acknowledges receipt of a segment by sending a packet that indicates the next sequence number it expects.
E
If the destination device does not receive a segment, all segments are retransmitted.
F
The source device keeps a record of all segments sent and expects and acknowledgment of each.
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更多 “多选题Regarding PAR (Positive Acknowledgement and Re-transmission), which of the answer choices below are correct?（）AThe source device will only retransmit lost packets on the request of the destination device.BThe source device starts a timer when it sends a segment and retransmits if an acknowledgment is not received before the timer expires.CThe destination device acknowledges receipt of a segment by sending a packet with a new sequence number and the ACK bit sent.DThe destination device acknowledges receipt of a segment by sending a packet that indicates the next sequence number it expects.EIf the destination device does not receive a segment, all segments are retransmitted.FThe source device keeps a record of all segments sent and expects and acknowledgment of each.” 相关考题
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