GATE 2013 CS (CS1) – Question 24

Computer Networks · Principles of Layering · 1 mark · Multiple choice

S and D communicate through two intermediate routers. How many network-layer and data-link-layer visits occur per packet?

Network 4, data link 4
Network 4, data link 3
Network 4, data link 6
Network 2, data link 6

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Show answer and explanation

Correct answer: (C) Network 4, data link 6

Explanation

The packet reaches the network layer at S, both routers and D: four visits. Each of three physical links requires link-layer processing at both ends: six visits. Routers decapsulate incoming frames and create outgoing ones. Thus C.

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