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Old 06-22-2006, 10:19 AM
Innovative2001
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Hello...

As earlier mentioned that all the layers have their importance. Mostly the Network, transprot and application layers are the most important and very useful layers in routing. Here I have provided one URL that will help you to found the applications of different layers and different way as a pictorial representation:

http://images.google.co.in/images?q=...mages&ct=title