What is a primary role of the Physical layer in transmitting data on the network?

The primary role of the Physical layer in network communication is to create the signals that represent the bits in each frame and transmit these signals over the physical medium. This includes defining how bits are electrically or optically signaled through the medium, whether it be through copper cables, fiber optics, or wireless signals. The Physical layer is responsible for establishing the physical connection between devices and ensures that the data is transmitted as bits in a form suitable for the transmission medium.

Understanding the function of the Physical layer helps clarify its importance in the entire data communication process. By focusing on how data is physically transmitted, this layer is essential for enabling actual communication over the physical connections that exist in a network infrastructure.