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Official PYQ · 2004Q15Concept of Layering: OSI and TCP/IP Protocol StacksMCQ1 mark

GATE CS 2004 Q15 — Concept of Layering: OSI and TCP/IP Protocol Stacks

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Choose the best matching between Group 1\text{Group 1} and Group 2\text{Group 2}

Group-1Group-2P. Data link layer1. Ensures reliable transport of data over a physical point-to-point linkQ. Network layer2. Encodes/decodes data for physical transmissionR. Transport layer3. Allows end-to-end communication between two processes4. Routes data from one network node to the next\begin{array}{|l|l|}\hline \textbf{Group-1} & \textbf{Group-2} \\ \hline \text{P. Data link layer} & \text{1. Ensures reliable transport of data over a physical point-}\\ & \text{to-point link} \\ \hline \text{Q. Network layer} & \text{2. Encodes/decodes data for physical transmission} \\ \hline \text{R. Transport layer} & \text{3. Allows end-to-end communication between two }\\ & \text{processes} \\ \hline \text{} & \text{4. Routes data from one network node to the next} \\ \hline \end{array}

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Answer: A

We can match the layers of the OSI model to their primary responsibilities as follows:

  • P. Data Link Layer: Responsible for node-to-node delivery of frames over a physical point-to-point link, including error detection and flow control. This matches with 1 (Ensures reliable transport of data over a physical point-to-point link).
  • Q. Network Layer: Responsible for routing packets from the source host to the destination host across multiple intermediate network nodes. This matches with 4 (Routes data from one network node to the next).
  • R. Transport Layer: Responsible for process-to-process (end-to-end) delivery of the entire message. This matches with 3 (Allows end-to-end communication between two processes).

Note that statement 2 (Encodes/decodes data for physical transmission) is a primary responsibility of the Physical Layer.

Thus, the correct matching is P-1, Q-4, R-3, which corresponds to option A.

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