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The OSI Model

 
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RyanF109



Joined: Mon Jan 02, 2012 7:53 pm
Posts: 16

PostPosted: Sat Jun 22, 2013 10:27 pm    Post subject: The OSI Model Reply with quote

I'm currently writing a series on the OSI Model on my Linux blog. Any feedback (or criticism) would be welcomed.

http://www.linuxstudent.com/the-osi-model/
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TonyLB
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Joined: Tue Apr 12, 2005 8:08 pm
Posts: 112
Location: Wirral, UK

PostPosted: Sat Jul 13, 2013 3:04 pm    Post subject: Reply with quote

Interesting, but AFAIK this model is not actually used. In practice there are I think only 4 layers handled, the 'Internet Reference Model' which has Application/Transport/Internet/Link.

See for example the Tanenbaum book on Computer Networks.
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guy
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Joined: Thu Apr 07, 2005 1:07 pm
Posts: 1041
Location: Worcestershire

PostPosted: Sat Jul 13, 2013 4:40 pm    Post subject: Reply with quote

I do find it confusing that you describe your model as an explanation of the OSI model and then go on to explain that it is different.

There are many layered models for traffic over different kinds of network and several in common use on the Internet. None of these uses the OSI model, and the most common (TCP/IP) breaks it quite significantly - almost as much as your Lego model does.

The OSI model is a theoretical stack of seven specific layers which may be used as a reference to compare and clarify differences in the other models.

Rather, I would see your discussion as a basic introduction to layered networking in general rather than specifically to the OSI model.

Also, the user data en bloc is not really a network layer. For example the OSI top layer stops at ensuring correct delivery and maybe reassembly to the right logical recipient, it has no concept of what James actually cut up. so really, you have produced a four-layer network model.

But I do like your approach.

HTH
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RyanF109



Joined: Mon Jan 02, 2012 7:53 pm
Posts: 16

PostPosted: Tue Jul 16, 2013 12:35 am    Post subject: Reply with quote

guy wrote:
I do find it confusing that you describe your model as an explanation of the OSI model and then go on to explain that it is different.


Thanks for the feedback guys. The reason for this confusion was a permalink error in wordpress. It should now act correctly and link you to the correct place.

For reasons that I won't go into, I've based it around Higher/Adv Higher Computing which covers the OSI Model, hence why I wrote about it.
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