What is the purpose of an OSI model? The purpose of an OSI model is a standard that was created for networks to share information. This standard governs the way information is transmitted over different networks. The model also sets guidelines to those in the manufacturing industry that create and develop software and hardware that are all compatible with each other. This paper will discuss and describe the 7 layers of the Open System Interconnection model (OSI model) and the layers of the Transport Control Protocol/Internet Protocol model (TCP/IP model), and explain the similarities and differences of each model. The 7 layers of the OSI model consist of: The Application layer (layer 7), The Presentation layer (layer 6), The Session layer (layer 5), The Transport layer (layer 4), The Network layer ( layer 3), The Data Link layer (layer 2) and The Physical layer (layer 1). All 7 layers together is referred to as the “Stack”, when data is transmitted it begins at the “Application” layer and end in the “Physical” layer. Here is a description of each layer of the OSI model in order from highest to lowest. The easiest way to remember the layers is my memorizing the following “ All People Seem To Need Data Processing”. The 7 layers are: The Application layer –
The Application Layer is the top layer of the OSI model. It provides a set of interfaces for applications to obtain access to networked services as well as access to the network services that support applications. The Presentation layer -
The Presentation Layer handles data format information for networked communications. This is done by converting data into a generic format that could be understood by both sides. The Session layer –
The Session layer allows two parties to hold ongoing communications called a session over a network. This comes into play at the beginning and end of data transmission. This layer also manages errors that occur in the upper layers, such as a low memory or low disk space. The...
References: Wikipedia Foundation Inc. (Sept. 2008)
Retrieved 09/06/08 from
Twiggs. W ( Dec 2000) Open System Interconnection – An Introduction to the OSI Model and Layered Communications.
Retrieved 09/07/08 from http://www.comtest.com/tutorials/osi.html
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