Which OSI layer handles node-to-node data transfer and error detection?

Which OSI layer handles node-to-node data transfer and error detection?

• A. Data Link
• B. Physical
• C. Network
• D. Transport

Answer: (A)

Node-to-node data transfer and error detection are handled by the Data Link layer. This layer takes raw bits from the Physical layer and organizes them into frames for transmission between adjacent network nodes. It provides hardware addressing (like MAC addresses) to identify the next hop on the local link and includes error-detection mechanisms (such as a frame check sequence or CRC) to detect corrupted frames. If a frame is received with errors, it can be discarded or retried before moving up to upper layers, ensuring reliable delivery between neighboring devices. The Physical layer is only responsible for the physical transmission of bits over the medium, without any framing or error checking. The Network layer handles routing and logical addressing across networks, not the immediate link. The Transport layer deals with end-to-end reliability and flow control between devices across an entire path, rather than just between directly connected nodes.

Node-to-node data transfer and error detection are handled by the Data Link layer. This layer takes raw bits from the Physical layer and organizes them into frames for transmission between adjacent network nodes. It provides hardware addressing (like MAC addresses) to identify the next hop on the local link and includes error-detection mechanisms (such as a frame check sequence or CRC) to detect corrupted frames. If a frame is received with errors, it can be discarded or retried before moving up to upper layers, ensuring reliable delivery between neighboring devices.

The Physical layer is only responsible for the physical transmission of bits over the medium, without any framing or error checking. The Network layer handles routing and logical addressing across networks, not the immediate link. The Transport layer deals with end-to-end reliability and flow control between devices across an entire path, rather than just between directly connected nodes.