media, signal, and binary transmission.  -most common layer to have a fault  -sends data in bits (1 and 0)  - rf, light, or electrical pulses (transmission medium)
media, signal, and binary transmission.  -most common layer to have a fault  -sends data in bits (1 and 0)  - rf, light, or electrical pulses (transmission medium)
layer 1. turns raw bits into electrical signaling and defines physical network media such as copper cabling, fiber optics, and wireless transmission standards. concerned with bit rates and transmission modes.