It divides the communications processes into seven layers. Describes the need for a layered approach, and discusses the function of each of the layers. It was developed as part of the open systems interconnection osi initiative. In the sevenlayer osi model of computer networking, the physical layer or layer 1 is the first and lowest layer. The osi model open system interconnection model defines a computer networking framework to implement protocols in seven layers. Osi model is most important topics and every exam contain some questions from osi model data communication and networking subject,this osi model online test contain some of the best and most frequently asked questions in the competitive exams. Isoosi model and its layers physical to application. Osi model osi means open system interconnect model. Osi reference model the open systems interconnection osi model was developed by the international organization for standardization iso, and formalized in 1984.
A layered network model the process of breaking up the functions or tasks of networking into layers reduces complexity. Confusingly, the osi was a working group within the iso international standards organisation and. Since the discussion of networking often includes talk of extra layers,this paper will address these unofficial layers as well. Each layer both performs specific functions to support the layers above it and offers services to the layers below it. The network layer is a complex layer that provides connectivity and path selection between two host systems that may be. Although tcpip has been used for network communications before the adoption of the osi model, it supports.
Ppt osi model powerpoint presentation, free download id. Download 100 % free ebooks, ppts, study notes, novels, etc. Application layer this layer combines functionalities of the three top layers of the osi model and may also be called the processapplication layer. Instead of serving as protocol, the osi model has become a teaching tool that shows how different tasks within a network should be handled in order to promote errorfree data transmission. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. A free powerpoint ppt presentation displayed as a flash slide show on id. Ppt osi model powerpoint presentation free to view. The implementation of this layer is often termed phy. Osi model and standards itnw 25, chapter ii osi layer functions data link, frame handling.
The physical layer consists of the basic networking hardware transmission technologies of a network. Osi model osi model open systems interconnection osi is a set of internationally recognized. Network data link physical the seven layers of the osi model cont. The function of each layer should be chosen according to the internationally standardized protocols. Reduces complexity standardizes interfaces facilitates modular engineering ensures interoperable technology accelerates evolution simplifies teaching and learning application presentation session transport network data link physical. It is responsible for the actual physical connection between the devices. A layer should be created where different level of abstraction is needed. With an intuitive interface and powerful settings, the ppt to pdf converter offers an easy access for both novice users and professionals to produce pdf files from windows documents, and thus makes it. Provides connectivity and path selection between two host systems routes data packets selects best path to deliver data the network layer prioritizes data known as quality of service qos. Below we have the complete representation of the osi model, showcasing all. Ppt osi model powerpoint presentation free to download id. If you need to create an osi model diagram for a powerpoint presentation then here we will show you how to design this osi model using shapes and smartart. The osimodel isnt just a model to make networks compatible.
It is responsible for transmitting individual bits from one node to the next. Each layer provides a service to the layer above it in the protocol specification. The lowest layer of the osi reference model is the physical layer. Although the osi model defined a set of standards, it is important to note that it is merely a model. To briefly discuss the functions of each layer in the osi model.
Conceived in the 1970s when computer networking was taking off, two separate models were merged in 1983 and published in 1984 to create the osi model that most people are familiar with today. Many other models exist in the networking industry. Free download computer networking powerpoint presentation. Each layer communicates with the same layers software or hardware on other computers. The osi model network security about osi model to show how to facilitate communication between. The upper four layers of the osi model application, presentation. Ppt osi reference model powerpoint presentation free. The osi model is a layered framework for the design of network systems that allows for communication across all types of computer systems. Layer 6, the presentation layer, is responsible for how an application formats the. Osi model 7 layers explained pdf layers functions what is osi model. Although the iso has created protocols that operate at each of the higher layers of its model, very few entities have standardizaed on the osi protocol suite, due mainly to the overbearing popularity of.
The uploader spent hisher valuable time to create this computer networking powerpoint presentation slides, to share hisher useful content with the world. The osi model layers are typically described from the top layer down. The open systems interconnection osi model is a reference tool for. The physical layer contains information in the form of bits. In the osi model, the definition of its application layer is narrower in scope, distinguishing explicitly additional functionality above the transport layer at two additional levels. In its most basic form, it divides network architecture into seven layers which, from top to bottom, are the application, presentation, session. Ppt osi model and standards powerpoint presentation. See more ideas about osi model, computer network and network layer.
The open system interconnection model, better known as the osi model, is a network map that was originally developed as a universal standard for. The osi model characterizes computing functions into a universal set of rules and requirements in order to support interoperability between different products and software. The number of layers should be large enough that distinct functions should not be put in the same layer and small. Keep this in mind since when you are studying networking you will see people refer a lot to the osi model. The open systems interconnection osi model is a reference tool for understanding data communications between any two networked systems. What is osi model in networking how osi model works. Describe the purpose of the osi model and each of its layers explain specific functions belonging to each osi model layer understand how two network nodes. In its most basic form, it divides network architecture into seven layers which, from top. A networking model offers a generic means to separate computer networking functions. Also, some of the most popular applications email, file transport, and so on interface with this layer to communicate with other applications on the network. Osi model describes the flow of information from one computer to another. The osi model is mainly a reference model as opposed to a mainstream protocol suite.
Osi model open system interconnection this divides the networks into the 7 layers the protocol perform services to unique layers protocol interacts with protocol in layer directly above and below protocol. Introducing the osi model in networking tutorial 06 may. When receiving data, this layer will get the signal received and. The osi model open systems interconnection model is a conceptual framework used to describe the functions of a networking system. The osi model consists of seven layers, each corresponding to a specific network function. Osi model open systems interconnection osi is a set of internationally recognized, nonproprietary standards for networking and for operating system involved in. Nevertheless, in order to ease the exchange of ideas, even those who only ever use tcpip will refer to the 7layer model when discussing networking principleswith peers from a different networking background. Ppt osi model powerpoint presentation free to view id. Browse predesigned collection of 0814 osi reference model with 7 layers. Osi model in networking stands for open system interconnection model.
It is therefore often referred to as the osi seven layer model. This document is highly rated by computer science engineering cse students and. Osi model presentation powerpoint powerpoint presentation ppt. Osi model osi model consists of seven separate layers, each defines a segment of the process of moving information across a network physical layer 1 data link layer 2 network layer 3 transport layer 4 session layer 5 presentation layer 6 application layer 7 5. To discuss the osi model and its layer architecture and to show the interface between the layers. In its most basic form, it divides network architecture into seven layers which, from top to bottom, are the application, presentation, session, transport, network, datalink, and physical layers. The osi model is the most widely taught as the foundation for this knowledge. All nics connected to the same physical segment of the network receive. The layers are described as application, presentation, session, transport, network, data link, and. The open systems interconnection osi model is a product of the open systems interconnection effort at the international organization for standardization. Osi had two major components, an abstract model of networking, called the basic reference model or sevenlayer model, and a set of specific protocols. The open systems interconnect model osi explain the reasoning for using a model like the osi for. A technical seminar on osi model linkedin slideshare.
Ppt osi reference model powerpoint presentation free to download id. Ppt osi model powerpoint presentation free to download. Of a computer network ppt slides powerpoint templates, presentation slides graphic. Computer networks pdf notes free download cn notes. It provided the first framework governing how information should be sent across a network. The osi model established in 1947, the international standards organization iso is a multinational body dedicated to worldwide agreement on international standards. The osi network management model article pdf available in ieee communications magazine 315. The osi model and the tcpip protocol suite, engineering computer science engineering cse notes edurev is made by best teachers of computer science engineering cse. Osi model osi model open systems interconnection osi is a set of internationally recognized, nonproprietary standards for networking and for operating system involved in.
It defines seven layers or levels in a complete communication system. An iso standard that covers all aspects of network communications is the open systems interconnection osi model. A protocol in the networking terms is a kind of negotiation and. Osi specifies strict modular separation of functionality at these layers and provides protocol implementations for each layer. The osi reference model was a major advance in the teaching of network concepts. Introduction to the osi model networking in plain english. Osi layers ppt free download as powerpoint presentation. Finally, this paper will draw comparisons between the theoretical osi model and the functional tcpip model.