The protocol data unit (PDU) for the application layer in the Internet stack is
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GATE CSE 2012 · Q10
MCQ1 markEasy
Time
The protocol data unit (PDU) for the application layer in the Internet stack is
Select one answerSingle correct
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Solution
Step-by-step verified solution
Official answer: C) Message
Principles of LayeringIn the Internet protocol suite (TCP/IP stack), the Protocol Data Units (PDUs) at different layers are:
Application layer: Message
Transport layer: Segment (for TCP) / Datagram (for UDP)
Network layer: Datagram / Packet
Data Link layer: Frame
Physical layer: Bit
Therefore, the PDU for the application layer is Message, corresponding to option (C).
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Examiner trap
The misconception this question tests
Recall the standard terms for data units across layers: Frame (Data Link), Datagram/Packet (Network), Segment (Transport), and Message (Application).
This Principles of Layering previous year question is Q10 of the GATE CSE 2012 paper. Find more GATE CSE PYQs on Principles of Layering in Computer Networks, or browse all GATE CSE PYQs.
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Principles of Layering in GATE CSE
Principles of Layering has 12 GATE CSE PYQs across 10 papers from 2011 to 2025. 9 of them are 1-mark MCQs like this one, and GATE CSE 2012 has 3.
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Independent practice explanation verified by the GateAI team. GATE is conducted by the IITs; question text follows the official paper.