What OSI model layers does the MAC Layer in DOCSIS encompass?

The MAC (Medium Access Control) Layer in DOCSIS (Data Over Cable Service Interface Specification) is primarily concerned with how data is encapsulated and transmitted over a physical medium. Within the OSI (Open Systems Interconnection) model, the MAC layer operates at two specific layers: the Physical Layer and the Data Link Layer.

The Physical Layer is responsible for the transmission of raw bitstreams over a physical medium, which includes the actual wiring or signaling used to send data. This encompasses aspects such as voltage levels, timing of voltage changes, and physical connectors.

The Data Link Layer, on the other hand, is responsible for defining how data packets are formed and addressed, and includes the MAC sublayer, which specifically manages access to the physical transmission medium and helps prevent collisions when multiple devices attempt to communicate over the same channel.

Thus, the correct answer highlights that the MAC Layer in DOCSIS encompasses both the Physical Layer and the Data Link Layer, providing essential functions for managing data transmission in a network that uses cable as its communication medium.