COMPUTER NETWORKING

Detailed explanation-1: -The 7 layers of the OSI model. The layers are: Layer 1-Physical; Layer 2-Data Link; Layer 3-Network; Layer 4-Transport; Layer 5-Session; Layer 6-Presentation; Layer 7-Application.

Detailed explanation-2: -Layer 7 of the OSI model, or the application layer, supports communications for end-user processes and applications, and the presentation of data for user-facing software applications.

Detailed explanation-3: -Layer 7 or the application layer of the OSI reference model deals directly with applications. Within this narrow scope, layer 7 is responsible for displaying data and images to the user in a format humans can recognize. This in turn enables users to interface with the presentation layer below the application level.

Detailed explanation-4: -However, the OSI 7-layer model is still widely used, as it helps visualize and communicate how networks operate, and helps isolate and troubleshoot networking problems. OSI was introduced in 1983 by representatives of the major computer and telecom companies, and was adopted by ISO as an international standard in 1984.