GATE CSE 2025 Session 1 Q16: Match OSI layers with their functions

Identify the ONE CORRECT matching between the OSI layers and their corresponding functionalities as shown.

OSI Layers	Functionalities
(a) Network layer	(I) Packet routing
(b) Transport layer	(II) Framing and error handling
(c) Datalink layer	(III) Host to host communication

Try it: multiple choice: exactly one correct option

Wrong answer costs 1/3 mark in GATE.

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Answer: B (official GATE 2025 final answer key)

Concept used: Responsibilities of the OSI layers.

First step: Routing is a network-layer job, framing is a data-link job, and end-to-end (host to host) delivery is the transport layer.

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Source: official GATE 2025 Session 1 CS question paper and final answer key, organised by IIT Roorkee. Question paper · Answer key