We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What is a Session Layer?

By Rodney A. Crater
Updated May 16, 2024
Our promise to you
EasyTechJunkie is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At EasyTechJunkie, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject-matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

The session layer is the fifth layer of the Open Systems Interconnection (OSI) model developed by the International Organization for Standardization (IOS). It is responsible for establishing, managing, and closing end-to-end connections, called sessions, between applications located at different network endpoints. Dialogue control management provided by the session layer includes full-duplex, half-duplex, and simplex communications. Session layer management also helps to ensure that multiple streams of data stay synchronized with each other, as in the case of multimedia applications like video conferencing, and assists with the prevention of application related data errors. The session layer is also responsible for ensuring proper data communications during remote procedure calls (RPCs).

There are seven distinct functional units, called layers, that the OSI model breaks up, or modularizes, into the different tasks for which network software and hardware are responsible. Layers below the session layer are primarily concerned with transmitting data on the network. The session layer, which is also commonly called layer 5 in computer networking, and layers above it primarily focus on interacting with and providing functionality to applications within a computing system. It interfaces with the transport layer, also called layer 4, so that data streams from applications may be segmented and seamlessly transmitted on to the network. Layer 5 also passes incoming data to the presentation layer, known as layer 6, for further processing before being given to an application.

When the OSI model was originally developed there was debate as to whether or not session layer protocols would be beneficial. A number of different network services, proprietary protocols, and OSI protocols have been successfully developed and demonstrate the importance of this layer. These include RPCs, the Structured Query Language (SQL), the X Windows System and X Terminal, Network File Services (NFS), the Apple Talk Session Protocol (ASP), and the Apple Talk Zone Information Protocol (ZIP). Without the session layer, it would be much more difficult to control computer application information being passed through networks.

These services and protocols perform a variety of functions. SQL is a computer language used to create requests which are sent to databases in order to retrieve specific information structured in a desired way. The X Windows System and X Terminal allow networked computers, some with limited capability, to connect to server computers so that the client computers have graphical and interface capabilities with devices such as monitors, mice and keyboards. NFS protocol emulates local access to files located on remote networked file servers. The ASP and ZIP Apple Talk protocols were used with early versions of Macintosh operating systems but were replaced by IP based protocols after the release of the Mac OS X operating system.

EasyTechJunkie is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Discussion Comments
EasyTechJunkie, in your inbox

Our latest articles, guides, and more, delivered daily.

EasyTechJunkie, in your inbox

Our latest articles, guides, and more, delivered daily.