What is the purpose of the Data Link layer in the OSI model?

The Data Link layer, which is the second layer of the OSI model, plays a crucial role in network communication. Its primary purpose is to provide node-to-node data transfer and to manage how data packets are framed for delivery over physical media.

Framing refers to the encapsulation of network layer packets into frames, which include not just the payload (the actual data) but also necessary control information such as addresses and error detection codes. This framing allows the receiving device to understand where the data begins and ends and to ensure that it can correctly interpret the information being sent.

Additionally, the Data Link layer is responsible for addressing within a local network. It utilizes MAC (Media Access Control) addresses to identify devices on the same network, allowing for the correct delivery of frames to their intended destination. The Data Link layer ensures that data is transmitted efficiently and accurately over a physical medium, thus serving as a vital bridge between the network layer above and the physical layer below.

In summary, the emphasis on framing and addressing clarifies why this is the correct answer, as they are fundamental functions of the Data Link layer in the OSI model.