Physical Layer (Layer 1)
- Purpose: Transmits raw bits over physical medium (electrical, light, radio).
- Examples: Cables, switches, radio signals
- Analogy: The actual wires or Wi-Fi signals that carry the envelope.
Examples
The Physical layer is responsible for:
- Transmission and reception of raw bit streams
- Hardware components (cables, antennas, transceivers)
- Environmental influences (moisture, EMI, etc.)