Which layer does the Data Link Protocol operate in the OSI model?

The Data Link Protocol operates at Layer 2 of the OSI model. This layer is responsible for node-to-node data transfer and provides the means for reliable data transfer over a physical link. It handles error detection and correction (to some extent), controls how data is placed and received from the medium, and addresses hardware addresses—essentially managing communication between devices on the same local network.

This capability is fundamental for both wired and wireless communication. Layer 2 ensures that the data frames are formatted correctly and that they can communicate effectively across the physical network, which is managed by Layer 1, but that layer does not provide the formatting or protocol-level functionality required for effective communication; those responsibilities lie with Layer 2.

In contrast, Layers 1, 3, and 4 have distinct functionalities—Layer 1 deals with the physical aspects of the network, such as cables and signals; Layer 3 focuses on the network-layer routing and logical addressing; and Layer 4 provides transport-layer services, including end-to-end communication and flow control. Each layer has a specific set of responsibilities, and understanding these helps clarify the role of the Data Link Protocol in the OSI model. Thus, identifying Layer 2 as the correct answer signifies recognizing its critical