What are two services performed by the data link layer of the OSI model?
The data link layer of the OSI model provides two main services: framing and error control.
1. Framing: The data link layer defines how a stream of data bits is divided into frames. It adds a header at the beginning of each frame and a trailer at the end, which contains control information such as the source and destination addresses. By framing the data, the data link layer ensures that the receiving device can distinguish between different frames and extract the data accurately.
2. Error Control: The data link layer is responsible for detecting and, if possible, correcting errors that may occur during data transmission. It achieves this through various error control mechanisms, such as parity checking, cyclic redundancy check (CRC), or checksum. These mechanisms enable the receiver to verify the integrity of the received data and request retransmission if errors are detected. Error control ensures reliable delivery of data across the physical link.
In summary, the data link layer’s framing service organizes the data into frames for transmission, while the error control service ensures the integrity and reliability of the data during transmission.
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