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.

时间:2022-10-04 17:11:04 所属题库:CCNA(640-801)题库

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