Which two functions are provided by the data link layer?

The data link layer plays a crucial role in the networking stack by managing how data is framed for transmission over the network and controlling access to the physical medium. One of its primary functions is to regulate frame access to the network media, which is essential for preventing collisions in a shared environment. This function ensures that multiple devices can send and receive frames efficiently without interfering with one another, maintaining the integrity and order of data as it traverses the physical layer.

In addition to managing media access, the data link layer is responsible for framing data packets from the network layer into frames suitable for transmission. It adds necessary headers and trailers to these frames, helps in error detection, and provides flow control, all of which are critical for reliable communication between adjacent network nodes.

In summary, the management of frame access to the network media stands as a vital function of the data link layer, facilitating effective communication and ensuring proper utilization of the network's resources.