Which OSI layer is primarily responsible for node-to-node data transfer and error detection, including MAC addressing?

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Multiple Choice

Which OSI layer is primarily responsible for node-to-node data transfer and error detection, including MAC addressing?

The Data Link layer is responsible for moving data from one node to the next on a local link and for detecting errors that occur on that hop. It encapsulates the network data into frames, uses MAC addresses to ensure the frame is delivered to the correct hardware on the local network, and adds an error-detection code (like a frame check sequence) so the receiving node can verify the frame’s integrity. This sits above the Physical layer, which only handles the actual transmission of bits, and below the Network layer, which deals with routing across multiple links. Higher layers deal with applications and data presentation, not the mechanics of delivering a frame to a neighboring device. The MAC addressing detail is a telltale sign that this is the Data Link layer.

The Data Link layer is responsible for moving data from one node to the next on a local link and for detecting errors that occur on that hop. It encapsulates the network data into frames, uses MAC addresses to ensure the frame is delivered to the correct hardware on the local network, and adds an error-detection code (like a frame check sequence) so the receiving node can verify the frame’s integrity. This sits above the Physical layer, which only handles the actual transmission of bits, and below the Network layer, which deals with routing across multiple links. Higher layers deal with applications and data presentation, not the mechanics of delivering a frame to a neighboring device. The MAC addressing detail is a telltale sign that this is the Data Link layer.

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