OSI stands for open access system interconnection reference model, and it is a set of protocol standards that has a lot of consensus. The OSI model is made up of seven levels, each of which might contain several sub-layers. According to studies based on the OSI, model application models and protocols of the Web and the OSI model of data transfer between the levels, and a contrast of OSI and TCP/IP. The OSI seven-layer clustering algorithm was developed to address network connection compatibility issues. Its main advantage is that it differentiates amongst three concepts: services, interfaces, and protocols; it simplifies issues; and, in the case of a network failure, it can quickly identify the fault level, making it easy to find and correct; service description of a layer. What is the top layer, which provides some functionality, the interface, which demonstrates how to utilize the lower layer of the services, and negotiations on how to reach this level of service? This has a strong autonomy between the layers, the interconnect network entities, and what type of agreement is no limit, as long as they are up to offer the same services.