单项选择题
A. Data, Frame, Packet, Segment, Bit
B. Data, Frame, Segment, Packet, Bit
C. Data, Packet, Frame, Segment, Bit
D. Data, Packet, Segment, Frame, Bit
E. Data, Segment, Frame, Packet, Bit
F. Data, Segment, Packet, Frame, Bit
单项选择题 What term is used to describe the process where one frame is placed into a different type of frame?（）
多项选择题 Regarding PAR (Positive Acknowledgement and Re-transmission), which of the answer choices below are correct?（）
单项选择题 Error detection schemes check errors in the data packets by reading which field frame IDs?（）