Which layer of the OSI Model is responsible for error detection with CRC checksums and flow control on a local network?

The Data Link Layer is the second layer of the OSI Model and is primarily responsible for node-to-node data transfer and ensuring reliable communication between two directly connected nodes. One of its critical functions is error detection through techniques like Cyclic Redundancy Check (CRC), which verifies that data packets have been transmitted accurately without corruption.

In addition to error detection, the Data Link Layer is also responsible for flow control, managing how data is sent and regulating the pace of data flow to prevent overwhelming the receiving device’s buffer. This is essential in local networks where multiple devices may be communicating simultaneously, as it helps maintain an orderly exchange of information and prevents data loss.

The other layers mentioned in the list have different responsibilities, focusing on higher-level functions such as routing data (Network Layer), ensuring end-to-end communication and data integrity (Transport Layer), and providing user interface and application services (Application Layer). Thus, the Data Link Layer indeed plays a crucial role in error detection and flow control, making it the correct choice for this question.