Which OSI Model layer handles error detection with CRC checksums and flow control?

The Data Link Layer, recognized as Layer 2 of the OSI Model, is responsible for the reliable delivery of data between adjacent network nodes. This layer is integral in ensuring that data is packaged correctly, meaning it can detect errors that may occur during transmission through techniques like Cyclic Redundancy Checks (CRC).

CRC is a method used to check data integrity—by applying a mathematical algorithm to the data, the sender generates a checksum. Upon receiving, the receiver performs the same calculation and compares the results. If there is a discrepancy, it indicates that an error has occurred during transmission.

In addition to error detection, the Data Link Layer also manages flow control, which helps manage the pacing of data transmission between devices. This prevents one device from overwhelming another by sending data too quickly, helping maintain a stable network operation.

Other layers, such as the Application Layer, Network Layer, and Transport Layer, serve different roles within the OSI model. The Application Layer deals with high-level protocols and user interfaces; the Network Layer handles routing and addressing between devices on different networks; and the Transport Layer ensures end-to-end communication and reliability but does not directly manage CRC checks or flow control for raw data frames. Thus, the responsibilities of error detection and