The Open System Interconection Seven Layers

Introduction The Open Systems Interconnection (OSI) reference model had a major impact on the development of the Internet protocol used today. Reference models were created by the International Organization for Standardization (ISO) in the 1980s. It is dedicated to global international standard protocols and defines the entire network communication process as seven structured layers. In ascending order, these layers are the physical layer, the data link layer, the network layer, the transport layer, the session layer, the presentation layer, and the application layer.

Each packet sent over the network is subdivided according to a seven-layer model. This seven-layer model is the OSI (Open Systems Interconnection) model. These seven layers are application, presentation, session, transport, network, data link, and physical layer. When data is assembled into packets, it occurs in the above order, but when packets are received and decomposed, they occur in reverse order. Splitting packets in reverse order makes the process of assembling packets, sending packets, dropping packets, and displaying information smoother.

Layered architecture The final innovation is to create an open system interconnection (OSI) 7-layer model, each layer supporting a well-defined function. The lowest layer (1) or the physical layer is a protocol such as "Ethernet" or "Wifi", and the application layer (7) has a web browser. The browser starts receiving packets from the server. These are summarized in the "physical layer". Now, sometimes more communication is needed. For example. If there is a problem with the server, the browser should throw a 404 error. Each of these steps involves a round-trip between the server and the browser.