OSI is the short form for Open Systems Interconnection. It is a networking suite developed by the International Standards Organizations, which was European dominated in the 1980s. There are 7 layers of the OSI model and they are basically the means by which the communications process is defined and divided into different tasks of moving information amid networked computers.
Below is a description of the layers that make up the OSI model in detail: the physical layer5 contains a description of the property objectives regarding the communications media which is rather diverse, the electrical properties and an analysis of the exchanged signals; The Data Link is the second layer and is used for an illustration of the logical organization in regard to how the data bits are transmitted on specific medium. It is applied in the definition of framing, check summing, and addressing the Ethernet package; The Net layer is basically used for a description of the process used by the exchange series to enable data delivery between the two nodes in the network.
The OSI model also contains a transport layer is used for describing the nature and quality of the delivered data. This layer is used for defining how and if retransmissions can be used to guarantee the delivery of data. The session layer is for describing the sequence of data organization when they are larger than the usual packets handled by the lower layers. This layer is the means with which a reply and request packet is paired in a procedure call that is remote. The presentation layer is used for describing the data syntax that is being transferred.
The most common role of the application layer is generally a description of how work actually gets accomplished, buy it is also capable of implementing the process of the filler system. It guarantees that the end-users are provided with the services and this is inclusive of the electronic messaging, file transfers, the network management and the virtual terminal access. A basic interaction exists between this layer and the user, hence the use of the terminology, Graphic User Interface (GUI) because the provided services are associated to the network communication which guarantees their running ability via the network.
The network services supplied by the application layer to the end users are typically protocols capable of working with the users data. A good example is that in an application of a web browser, this layers protocol HTTP is enabled to package the required data, send it and receive the contents of the web page. The application layer provides and obtains data to ands from the presentation layer respectively.
