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GATE | GATE CS 2012 | Question 10
  • Last Updated : 09 Oct, 2019

The protocol data unit (PDU) for the application layer in the Internet stack is
(A) Segment
(B) Datagram
(C) Message
(D) Frame

Answer: (C)

Explanation: The Protocol Data Unit  is the unit of communication at a particular layer.

 The Layer 1 (Physical Layer) PDU is the bit or, more generally, symbol 
 The Layer 2 (Data Link Layer) PDU is the frame.
 The Layer 3 (Network Layer) PDU is the packet.
 The Layer 4 (Transport Layer) PDU is the segment
              for TCP or the datagram for UDP.
 The Layer 5 (Application Layer) PDU is the data or message.

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