GATE CS 2025 Set 1 — Question 16
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Computer Networks → Network Fundamentals → OSI Model
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Question
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 |
Correct answer
(B) (a)-(I), (b)-(III), (c)-(II)
Solution
The functions of the layers are matched as follows:
1.Network Layer (a): Its primary function is Packet routing (I), determining the path for data to travel across the network.
2.Datalink Layer (c): It is responsible for Framing and error handling (II), organizing bits into frames and ensuring reliable node-to-node delivery.
3.Transport Layer (b): It manages Host to host communication (III) (often described as end-to-end or process-to-process communication), ensuring complete data transfer.
Thus, the correct matching is:- (a) (I)
- (b) (III)
- (c) (II)
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