Oops... 8^0 I messed up the layer levels, my bad! It has been over 20 years since I learnt them and it is not something that comes up more than once or twice in a decade. Besides Microsoft teaches network layers strangely and most of the people who blather on about the layers are MCSE's and we mostly know that means they can read, but until they get a few years of experience they do not know much that is of any practical use. It is more important to know how the communication layers work than how they classified.
