What model specifies four layers of functionality including the link layer, internet layer, transport layer, and application layer?

The model that specifies four layers of functionality including the link layer, internet layer, transport layer, and application layer is the Transport Control Protocol/Internet Protocol (TCP/IP) Model. This model provides a framework for understanding how data is transmitted across networks.

The link layer is the first layer, responsible for the physical transmission of data over a network medium, managing hardware addresses and protocol details that facilitate this exchange. The internet layer follows, defining protocols for routing and addressing data packets through diverse networks, ensuring that the data can travel to the correct destination. The transport layer is crucial for data transfer reliability and integrity, allowing for flow control, error correction, and ensuring that packets are delivered accurately. Lastly, the application layer encompasses the protocols and services that enable software applications to communicate over the network, allowing users to interact with network services.

This structured approach to categorizing network functions facilitates interoperability between different systems and technologies, making TCP/IP foundational to how networks and the internet operate. The other models mentioned do not align with this specific four-layer structure.