Which layer of the OSI model deals with the physical connection between devices?

The Physical Layer of the OSI model is responsible for the actual physical connection between devices. It encompasses the hardware aspects of networking, such as cables, switches, and other physical devices that transmit signals over a network. This layer defines the electrical, optical, and mechanical specifications to ensure that devices can communicate effectively by sending and receiving raw bit streams.

While the Data Link Layer also plays a vital role in network communication by providing node-to-node data transfer and error detection, it operates at a higher level than the Physical Layer. The Data Link Layer uses the physical connections established by the Physical Layer but does not handle the hardware specifics.

The Network Layer focuses on logical addressing and routing, enabling data to travel across multiple networks. It ensures that packets are sent from the source to the correct destination but does not concern itself with the actual physical medium used for transmission.

The Transport Layer is responsible for providing reliable data transfer, error recovery, and flow control, ensuring complete data transfer between end systems. However, it does not engage with the physical aspects of hardware connections.

In summary, the Physical Layer is fundamental as it establishes the environment in which communication occurs, making it crucial for the overall functionality of the networking process.