Network layer osi pdf download

Logical addressing provides a unique address that identifies both the host, and the network that host exists on. The network layer takes the segment, and appends the source and destination ip. Network architecture provides only a conceptual framework for communications between computers. Osi model layers in computer networks pdf by ramandeep singh page 1 osi osi stands for open system interconnection model osi model. A protocol in the networking terms is a kind of negotiation and rule in between two networking entities. Osi layering layering is a structuring technique which permits the network of open systems to be viewed as logically composed of a succession of layers. Application, presentation, session, transport, network, data link and physical in detail along with their. A layer should be created where different level of abstraction is needed. Actual communication is defined by various communication protocols. A layered network model the osi reference model is composed of seven layers, each specifying particular network functions. The international standards organization iso established in 1947 is a multinational body dedicated to worldwide agreement on international standards. The layer 3 switch functions at the network layer and performs the multiport, virtual lan, data pipelining functions of a standard layer 2 switch. It defines seven layers or levels in a complete communication system. Routing determines the best path to a particular destination.

Pdf on oct 27, 2018, abbas miry and others published osi model find, read and cite all the research you need on researchgate. The network layer is also concerned with the following. The function of each layer should be chosen according to the internationally standardized protocols. The model itself does not provide specific methods of communication. Presentation application session transport network data link physical layer 7 layer 6 layer 5 layer 4 layer 3 layer 2 layer. It can also perform basic routing functions between virtual lans. Isoosi model and its layers physical to application studytonight. Each layer provides a service to the layer above it in the protocol specification. Notice that the bottom layer is identified as the first layer.

Pdf the osi model and network protocols emma greening. Chapter 1 introduction to networking and the osi model. In other words, each layer has different features and network cases. This model defines seven layers that describe how applications run ning upon networkaware devices may communicate with each other. Layer 3 the network layer layer 3, the network layer of the osi model, provides an endtoend logical addressing system so that a packet of data can be routed across several layer 2 networks ethernet,token ring, frame relay, etc. It use to transfer data over a network which moves through different layer. Osi model 7 layers explained pdf layers functions what is osi model. Describe the functionality of lan, man, and wan networks. The process of breaking up the functions or tasks of networking into layers reduces complexity. The osi model open system interconnection model defines a computer networking framework to implement protocols in seven layers.