The OSI Model| DROP Organization
What is the OSI Model? The Open Systems Interconnection (OSI) model is the best means to get an understanding of the working of the Internet and the communication of computers over a network system. It is considered to be the first standard model for network communication. It was adopted by all major computer and telecommunication companies in the early 1980s. The OSI model describes seven layers by which the computer systems communicate over a network. The OSI model was introduced in 1983 by representatives of the major computer and telecom companies, and was later adopted by ISO as an international standard in 1984. However, the modern internet is based on the simpler TCP/IP model and not on OSI model. The OSI 7- layer model is used widely, which helps to visualize and communicate how the network operates, and helps to isolate and troubleshoot networking problems. 7 Layers of Open System Interconnection (OSI) Model The OSI model contains seven different layers, each consisting of a packet of protocols and are named according to their functions. We will discuss the OSI layers “top down” from the application layer that serves the end user directly, towards the physical layer. The 7 layers of OSI model are explained below: In brief, we can conclude that the data from the application layer has been segmented by the transport layer, converted into packets in the network layer, framed by the data link layer, by way of sequence of bitstreams. At last, the physical layer converts this bitstream into signals and transmits it into the media. The signals produced by the physical layer depend on the type of media used to connect the two devices. The signal can be an electrical signal for copper wire media, a light signal for optical fiber, and radio signal for wireless media. Advantages of OSI Model The following points describes the advantages of the Open Systems Interconnection (OSI) model: Conclusion In the present article, we presented a brief overview of the different layers of the OSI model. It is an important part to know about the functioning of the OSI model to properly understand the working principle of the internet. With the help of the OSI model, we can understand the working process of the internet in a simplified way. For the operation of the internet, many interconnected networking systems are utilized. For example, a device which is connected to another device through an optical fiber cable network. On the other hand, mobile phones and computers are connected to the internet via Wi-Fi or cellular network. Hence, our devices are connected to this optical fiber cable network. Want to start your learning journey on Cyber Security and Ethical Hacking field?