單項選擇題A PC on a network segment sends data to another PC on a different segment.Which of the following correctly describe the correct order of how this data will be encapsulated?（）

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


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1.單項選擇題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

2.多項選擇題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.

4.單項選擇題Which frame field do error detection schemes view to perform their function?（）

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

5.單項選擇題Which of one the following fields is contained within an IEEE Ethernet frame header?（）

A. source and destination MAC address
B. source MAC address and destination network address only
C. source and destination network address only
D. source network address and destination MAC address
E. source and destination MAC address and source and destination network address