单项选择题

What term is used to describe the process where one frame is placed into a different type of frame?（）

A. Framing
B. De-encapsulation
C. Encapsulation
D. De-framing
E. None of the above

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多项选择题

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.

单项选择题

Error detection schemes check errors in the data packets by reading which field frame IDs?（）

A.MTU
B.PDU
C.FCS
D.Flag
E.MAC
F.BRI

单项选择题

Which frame field do error detection schemes view to perform their function?（）

A. ERR
B. Flag
C. FCS
D. MTU
E. MAC
F. PDU