What is the corelation between each layer in osi model?
Nobody out in the real world uses the OSI model anymore. It’s nice and pretty to look at in a textbook, but it basically ends up blowing chunks when the rubber hits the road. The OSI model in particular doesn’t handle layering violations very well, so real-world things like “an ICMP Host Unreachable packet on layer 3 wants to tell a TCP connection on layer 5 that it ain’t gonna work” don’t fly in OSI. The actual Internet pretty much fuses the physical and data link layers, and session/presentation/application layers. http://en.wikipedia.org/wiki/OSI_model is about as clear an explanation of the OSI model as I’ve seen.
