The seven-layer architecture used to organize data transfer in networks is called which model?

• A. TCP/IP model
• B. OSI model
• C. Hybrid model
• D. Internet model

Answer: (B)

The concept being tested is recognizing a seven-layer reference model used to organize how data moves through a network. The OSI model, short for Open Systems Interconnection, is that framework. It defines seven layers from bottom to top: Physical, Data Link, Network, Transport, Session, Presentation, and Application. This model was created by the ISO to standardize communication between different systems and to help designers focus on specific functions at each layer, such as how data is physically transmitted, how routes are chosen, how reliability is managed, and how data is presented to applications. It’s mainly a conceptual guide that helps explain where different protocols fit in the data path. In contrast, the TCP/IP model—the practical stack most networks use today—has four layers and does not map directly to the seven-layer OSI structure, though it serves the actual Internet. Some sources may refer to “the Internet model,” but the named seven-layer framework described here is OSI.