Open System Interconnection Model

Open Systems Interconnection Model OSI is an acronym for Open Systems Interconnection which is the ISO standard of global communication and defines a network framework for implementing the layer 7 protocol. History and reasoning -------------------------- Early development of the network caused confusion. By the early 1980s, the number and size of networks increased dramatically. The company began to recognize the usefulness of the network, and with the introduction of new network technology, the network began to expand and expand the network.

First, let's break up the OSI model. The Open Systems Interconnection Model (OSI model) was created to standardize the communication structure within the technology. Basically, before the OSI model appeared, everyone had done whatever they wanted. Neither agreement nor standards allowed anyone to order pizzas online. Truly, this is a dark age. So what is the OSI model? Because it depends on how computers communicate with each other at various levels, these levels can easily be broken down into 7 different levels. These layers are as follows. Physical, data link, network, transport, session, presentation, and application

The Open Systems Interconnection (OSI) model (ISO / IEC 7498-1) is a conceptual model that characterizes and standardizes the internal functions of a communication system by dividing the communication system into abstraction layers. This model is the product of the International Organization for Standardization (ISO) open system interconnection project. This model groups similar communication functions into one of seven logical layers. One layer processes the layer above it and processes the layer beneath it. For example, a layer that provides error-free communication on a network provides the path required by the application above it and calls the next lower layer to send and receive packets that make up the content of that path. Two instances on one layer are connected by a horizontal connection on that layer

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.