What is one primary function of the data link layer?

One primary function of the data link layer is to provide for the exchange of frames over a common local media. The data link layer is responsible for the encapsulation of network layer packets into frames and controlling how these frames are placed on the physical media. It facilitates communication between devices on the same local area network (LAN) by managing the access to the physical medium and ensuring that data is transmitted without errors. This layer ensures that the data is correctly framed for transmission and that the receiving device knows how to interpret it.

Additionally, the data link layer handles physical addressing through MAC (Media Access Control) addresses, allowing devices to identify and communicate with each other within the same network segment. It also implements error detection and, in some cases, correction methods to ensure data integrity during transfer. This focus on local communication and frame management is what distinguishes the data link layer’s primary function in the networking model.