Which OSI layer is responsible for routing and logical addressing?

  1. Layer 1 (Physical)
  2. Layer 4 (Transport)
  3. Layer 3 (Network) ✓
  4. Layer 2 (Data Link)

Correct answer: Layer 3 (Network)

Option C is correct because Layer 3 of the OSI model, the Network layer, is responsible for logical addressing using IP addresses and for routing packets between different networks. Routers operate at this layer to determine the best path for data. Option A, Layer 1 (Physical), deals only with electrical signals, cables, and bit transmission, with no concept of addressing. Option B, Layer 4 (Transport), handles end-to-end communication, segmentation, and reliability using protocols such as TCP and UDP, not routing. Option D, Layer 2 (Data Link), handles MAC addressing and frame delivery within the same network segment, not cross-network routing.

Topic: · osi model, network layer, routing, logical addressing

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