OSI Model
From Wikiversity
 Please help develop this page
This page was created, but so far, little content has been added. Everyone is invited to help expand and create educational content for Wikiversity. If you need help learning how to add content, see the editing tutorial and the MediaWiki syntax reference. To help you get started with content, we have automatically added references below to other Wikimedia Foundation projects. This will help you find materials such as information, media and quotations on which to base the development of "OSI Model" as an educational resource. However, please do not simply copy-and-paste large chunks from other projects. You can also use the links in the blue box to help you classify this page by subject, educational level and resource type. |
|
[edit] Introduction
The Open System Interconnection (OSI) Model is a seven layer model developed by International Organization for Standardization (ISO) in the late 1970s. It is a layered, abstract definition for communications protocol and computer network protocol design. Every layer has certain functionalities which provide services to the layer immediately above it and below it. The seven layers are, from Top to Bottom, Application, Presentation, Session, Transport, Network, Data link and Physical layer.
[edit] Goals of the OSI Model
The goal of the OSI Model was to produce an open and standardized network model that would allow vendor-independent communication between networked devices. This was to offer an alternative to the many proprietary protocols developed by companies at the time which had effectively tied customers into buying from one main provider. Alongside the TCP/IP Model, the OSI Model also helps to teach students of networking by breaking down network transmissions into easily understandable modules so it is not uncommon to come across either of the models in a learning environment.
[edit] The OSI Layers
The OSI Layered Model defines the following seven layers:
- 7 - Application Layer
- 6 - Presentation layer
- 5 - Session layer
- 4 - Transport layer
- 3 - Network layer
- 2 - Data Link layer
- 1 - Physical layer
The OSI layers are often referred to by their layer number, for example, "IP is a layer 3 protocol".
