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The session layer provides the mechanism for opening, closing and managing a session between end-user application processes, i.e., a semi-permanent dialogue. optical fiber, coaxial cable, wireless, etc. It promoted the idea of a consistent model of protocol layers, defining interoperability between network devices and software.These comparisons are based on the original seven-layer protocol model as defined in ISO 7498, rather than refinements in the internal organization of the network layer.ISO/IEC 7498-1 is also published as ITU-T Recommendation X.200.Specific examples of cross-layer functions include the following:Data processing by two communicating OSI-compatible devices proceeds as follows:Message delivery at the network layer is not necessarily guaranteed to be reliable; a network layer protocol may provide reliable message delivery, but it need not do so.The OSI model was defined in ISO/IEC 7498 which consists of the following parts:The recommendation X.200 describes seven layers, labelled 1 to 7. This model has been criticized because of its technicality and limited features. So as the starting of your career it is good practice to have knowledge of this Model.OSI Model is a network model having seven different layers.

OSI protocols are a family of standards for information exchange. This Model is nothing but the standard adopted all over the globe. A header is added to the forwarded message for the convenience of the next layer. In computers, every aspect network plays a very important role. This has been a guide to the OSI Model. ; OSI consists of seven layers, and each layer performs a particular network function. The Open Systems Interconnection (OSI) model defines a networking framework to implement protocols in layers, with control passed from one layer to the next. The OSI model does not perform any functions in the communication process. All specifications mentioned in this model are getting followed by all the software and hardware devices.If we see in computer world networking is never-ending technology. Layer 3 – network. OSI model protocols O SI model stands for Open System Interconnection model. If a connection is not used for a long period, the session-layer protocol may close it and re-open it. Many of these protocols are originally based on the Internet Protocol Suite (TCP/IP) and other models and they often do not fit neatly into OSI layers.

Protocols of OSI model are very well hidden. Session-layer services are commonly used in application environments that make use of remote procedure calls (RPCs).Other examples of session layer implementations include Zone Information Protocol (ZIP) – the AppleTalk protocol that coordinates the name binding process, and Session Control Protocol (SCP) – the DECnet Phase IV session-layer protocol.An example of a session-layer protocol is the OSI protocol suite session-layer protocol, also known as X.225 or ISO 8327. It ensures that data is transferred in standardized formats by converting data formats into a format readable by the application layer.The following are the OSI protocols used in the seven layers of the OSI Model:The following are the presentation layer protocols: XDR, TLS, SSL and MIME.

Data and information are received by each layer from an upper layer.The transport layer works on two determined communication modes: Connection oriented and connectionless.


In the early- and mid-1970s, networking was largely either government-sponsored (NPL network in the UK, ARPANET in the US, CYCLADES in France) or vendor-developed with proprietary standards, such as IBM's Systems Network Architecture and Digital Equipment Corporation's DECnet. Knowing this model thoroughly you get command on the overall networking concept.

The OSI reference model was a major advance in the teaching of network concepts. This Model helps to transfer data over the network from one computer device to another. In plain English, the OSI provides a standard for different computer systems to be able to communicate with each other. You can also go through our other suggested articles to learn more –It is a key part of networking.
OSI Layer 5 - Session Layer In the seven-layer OSI model of computer networking, the session layer is layer 5. This article lists protocols, categorized by the nearest layer in the Open Systems Interconnection model. In the seven-layer OSI model of computer networking, the session layer is layer 5. Understanding OSI Model: The Open Systems Interconnection (OSI) model is divided into seven layers as shown in the below diagram: