Which of the following is a set of rules, procedures, and formats, defined in seven levels, or layers?

The OSI Reference Model is a conceptual framework used to understand and implement networking protocols in seven distinct layers. Each layer of the OSI model serves a specific function in the processes of data communication—these layers range from physical transmission to application interfaces.

By defining communication functions in these layers, the OSI model allows for clearer understanding and troubleshooting of network interactions. The seven layers—Physical, Data Link, Network, Transport, Session, Presentation, and Application—each provide specific services to the layers above and below them, facilitating interoperability among diverse networking systems.

This structured approach ensures that network services are modular and that different technologies can be integrated smoothly. Understanding these layers is critical for anyone working in networking, as it helps to conceptualize how data moves through networks and the roles of different networking hardware and software in this process.