Which OSI Model layer is known as Layer 1?

The Physical Layer is known as Layer 1 of the OSI Model. This layer is primarily responsible for the physical transmission of data over a communication medium. It deals with the actual hardware elements involved in the communication process, such as cables, switches, and the electrical signals or optical signals used to transmit data. The functions of the Physical Layer include defining the physical characteristics of the network, including voltage levels, timing of voltage changes, physical data rates, and the physical connectors used in the network.

Understanding the role of the Physical Layer is crucial for anyone involved in technology deployment and installation, as it establishes the foundation for the overall network communication. It directly affects how data is transmitted and received, influencing the performance of higher layers of the OSI model. Each component and technology at this layer must align with the requirements of the medium being used to ensure effective data transmission.