What is the general term that is used to describe a piece of data at any layer of a networking model?

Question:
What is the general term that is used to describe a piece of data at any layer of a networking model?

• frame
• packet
• protocol data unit
• segment

Explanation: The term protocol data unit (PDU) is used to describe a piece of data at any layer of a networking model. A packet is the PDU at the network layer. A frame is the data link layer PDU. A segment is the PDU at the transport layer.

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