Exploring the 7 Layers of Osi Models Information Technology Essay
Interim summary. So far we've covered three of the five layers. To summarize, the physical layer is responsible for sending a single bit, 1, over the network. The data link layer is responsible for: Find out why the OSI model was created, along with the purposes and benefits of the OSI model. A network model describes how information is transferred from one network component to another. Just as a house blueprint defines the materials and technologies used in the construction of the house, a network model defines the. The full form of the OSI model is Open Systems Interconnection and it defines how data should be transferred between two systems with different hardware and software around the world. For example, if two computers have different operating systems, how they communicate with each other, to solve this problem and for success, the layers of the OSI model are explained. As mentioned earlier, the OSI model offers seven layers: the physical, data link, network, transport, session, presentation, and application: application layer. This is the layer closest to the end user. The application layer is typically used by end-user software such as email clients and the Internet. The user told the web browser that information from a website is desired. As the user types this address in the address bar, there is no networking involved, but the OSI model considers this as OSI Model: Application Layer. Web browser has indicated that insecure communication is OK. If security were required, HTTPS would, from the user's point of view, enter data into the network via software running at the application layer. Through the session, transport, network and data link layers and arriving at the other end, the physical layer, the data travels back through the seven layers to arrive at its intended destination. Each layer has its own protocols, Presentation layer. Presentation layer • The presentation layer is concerned with the format of the data • It records that the email is plain text or rich text and that the photo is a graphics file, for example jpeg • The data is in the form of a data stream • Any compression or encryption can also be performed by the presentation layer. The bottom three layers -3 of the OSI model deal with hardware communications. The top three layers -7 relate to software and build on the specifications and protocols of the lower layers. The middle layer is the heart of the OSI model. It is responsible for merging the top and bottom layers into one seamlessly. The OSI or Open System Interconnection model defines a network framework to implement protocols in seven layers. Control is passed from one layer to the next, starting at the application layer in one station, and continuing to the bottom layer, across the channel to the next station and back up the hierarchy.