📖 9. Introduction to Data Link Layer

📖 From Data Communication and Networks • 156 questions available

About 9. Introduction to Data Link Layer

The data link layer transforms raw physical transmission into a reliable link by organizing bits into frames, addressing devices via MAC addresses, and managing access to shared media. It sits between the physical and network layers, providing services like framing, flow control, and error handling to shield upper layers from hardware imperfections, ensuring that data delivered to the network layer appears as a clean, ordered stream despite underlying noise or collisions.

This layer is uniquely divided into two sublayers: Logical Link Control (LLC) for protocol multiplexing and flow/error control, and Media Access Control (MAC) for hardware addressing and channel arbitration. Its responsibilities vary significantly between point-to-point links and broadcast networks, requiring different strategies for collision avoidance and frame delimitation, making it the most hardware-dependent yet universally critical layer for local network functionality.

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🔄 Last updated: 2026-07-31