Below is another video that give you more information about 7 Layers of OSI Network Model on Cisco Systems. The Understanding the OSI Reference Model by Cisco Systems was presented by Eric Jefferson who did a great job of explaining the 7 Layers OSI Model.
OSI (Open Systems Interconnection) Network Layer
Open Systems Interconnection (OSI)Model was developed and defined by the International Standards Organization (ISO). This model was created to define functional communications system in terms of abstraction layers. This reference model is widely used by equipment manufacturers to assure their products inter-operate with products from other vendors.
There are 7 layers all together for this OSI network layer which are listed below ordering from top to lower layer:
Layer 7 Application
Layer 6 Presentation
Layer 5 Session
Layer 4 Transport
Layer 3 Network
Layer 2 Data Link
Layer 1 Physical
Below is the video to show you in more detail about this OSI Network Model. But, If you prefer reading rather than watching, please visit http://en.wikipedia.org/wiki/OSI_model.
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