Computer Science for IGCSE & O level - Data Transmission (Section 4 - No. 49)

What is the purpose of the 'physical layer' in the OSI model?

To provide reliable data transfer.

To manage network addresses.

To define the physical transmission media.

To convert data to a transmittable format.

The physical layer (Layer 1) defines the physical aspects of the network, such as cables and connectors.