What device is considered a layer 1 device?

A layer 1 device refers to hardware that operates at the physical layer of the OSI model, which is responsible for the transmission and reception of raw bit streams over a physical medium. Examples of layer 1 devices include cables (like Ethernet cables), network interface cards (NICs), and hubs. These devices do not interpret the data being transmitted; they simply facilitate the connection and transfer of signals between devices in a network.