What is the simplified model of network communication that has four layers called?

The simplified model of network communication that consists of four layers is known as the Transmission Control Protocol (TCP) Model. The TCP model, often referred to in conjunction with the Internet Protocol Suite, simplifies the networking process by breaking it down into four layers: the application layer, transport layer, internet layer, and link layer. This model focuses on how data is transmitted over the network and how different protocols interact at each layer to facilitate communication.

The TCP model is specifically designed to reflect the way communication occurs on the internet, particularly with TCP and the associated protocols like UDP (User Datagram Protocol) that operate primarily at the transport layer. This four-layer approach allows for a more straightforward understanding of how data moves through networks and aids in the design and implementation of network protocols.

In contrast, the OSI model is a more comprehensive seven-layer framework that includes additional layers such as session and presentation layers, making it more complex. The other choices, like Application Layer Interface and Network Structure Protocol, do not represent widely recognized models within network communication, which makes them less relevant in this context. The TCP model's structured layers ensure a clear framework for network functionality, making it essential for understanding modern networking principles.