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Session layer

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- In the Open Systems Interconnection (OSI) communications model, the Session layer (sometimes called the "port layer") manages the setting up and taking down of the association between two communicating end points that is called a connection. A connection is maintained while the two end points are communicating back and forth in a conversation or session of some duration. Some connections and sessions last only long enough to send a message in one direction. However, other sessions may last longer, usually with one or both of the communicating parties able to terminate it.

For Internet applications, each session is related to a particular port, a number that is associated with a particular upper layer application. For example, the HTTP program or daemon always has port number 80. The port numbers associated with the main Internet applications are referred to as well-known port numbers. Most port numbers, however, are available for dynamic assignment to other applications.

Learn more about The OSI Model

OSI -- Securing the stack: An OSI model security reference with links to tips in "OSI -- securing the stack" series.
Extending OSI to Network Security -- Chapter 1 of 'Hack the Stack': The goal of this chapter is to take the well-known Open Systems Interconnect (OSI) model and use it to present security topics in a new and unique way.
OSI model: Crash Course: The OSI model is the conceptual backbone of most enterprise networks, but do you remember all the details? Read our rundown of the OSI model and what all those layers do.
FastFacts on the OSI model: These resources will help you better understand the OSI model and all those layers in a snap.
The best of 2004: What was on your mind during 2004? We've compiled our most popular content for the year; browse through for a refresher on the technologies you'll need to carry you into 2005.
Understanding Layer 2, 3, and 4 protocols: This chapter excerpt explains the layers of the OSI model, switching, TCP, UDP, and VRRP.

LAST UPDATED:

10 Oct 2006

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