Which of the following is not a feature of the OSI Layer 3?

The OSI Layer 3, also known as the Network layer, is responsible for routing packets of data across multiple networks. It focuses on logical addressing, as this layer uses IP addresses to identify devices on a network and facilitate the correct routing of information. The features that correctly describe Layer 3 include supporting routing protocols, dealing with logical addressing, and enabling communication between different networks.

By identifying "provides a physical medium for data transmission" as the correct answer, it highlights an important distinction in the OSI model. This feature is associated with Layer 1, the Physical layer, which deals with the physical connection between devices, including the transmission of raw bitstreams over a physical medium like cables or wireless signals and not with the logical operations conducted at Layer 3. Understanding the specific roles of each OSI layer is crucial for anyone involved in network management or design.