The protocol data unit (PDU) for the application layer in the Internet stack is
20122025
The protocol data unit (PDU) for the application layer in the Internet stack is
Answer: C. Message — Key idea: the application layer exchanges whole messages between programs; that unit is the application-layer PDU. Application layer → Message (the correct…
- A.
Segment
- B.
Datagram
- C.
Message
- D.
Frame
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Correct answer: C
Key idea: the application layer exchanges whole messages between programs; that unit is the application-layer PDU.
Application layer → Message (the correct PDU for this question)
Transport layer → Segment for TCP (or datagram for UDP)
Network layer → Packet or IP datagram
Data link layer → Frame
Therefore, the correct answer is Message because the application layer deals with complete messages exchanged by applications.
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