View Comments TMUP 145: Using Mac and Windows together »

1. Generally these topics from Bart are very helpful. However, while he did provide a decent overview of how the OSI layers work together, he frequently referenced them incorrectly.

   There is no OSI Layer 0, for example. He also kept referencing Layer 2 incorrectly. Layer 2 handles mostly media access and framing — not routing. Layer 3 handles the routing, via different routing protocols, usually OSPF (Open Shortest Path First), but there are several others and different implementations. I won't even get into the Layer 4 issue.

   Normally I don't comment on something like this, but I feel it's important enough to bring up.

   It almost sounded like he was also mixing the TCP/IP Model with the OSI 7 Layer model (1 -7, not 0-6). They are different.

   For clarification and for a fun read, check out this explanation on Routergod.
   http://routergod.com/ccnabootcamp/osi.html

   Comment by one1step1 — August 27, 2008 @ 10:59 am

2. Thanks for the feedback. I'm sure Bart will respond himself. I don't think he was trying to explain the OSI layers in the cynical sense. Thanks for the comments

   Comment by typicalmacuser — August 27, 2008 @ 11:46 am

3. Hi one1step1,

   If I mentioned layer 0 that was a definite mistake. In hind-sight I should probably have used the names rather than the numbers, possibly less confusing though a lot more of a mouthful for me! I started by saying I'd be talking about the 4 layer TCP/IP model. I did mention OSI once, but only to say that I wouldn't be talking about it because it's far too complex and really just used academically.

   I'm pretty sure I kept the layers straight for most of the segment, if I didn't then I can only apologise.

   Bart.

   Comment by Bart Busschots — August 27, 2008 @ 5:28 pm

4. Ah, well, then that might make more sense, except for the layer 0 referrals.
   Perhaps I missed the intro when you noted that. I will go back and listen to it again when I get a chance. I probably should have before I commented. Otherwise, nice work at explaining it. Odds are I jumped the gun and missed the part where you mention the TCP/IP model. Sorry about that! I tend to think in the OSI model too often I guess.

   Comment by one1step1 — August 27, 2008 @ 5:33 pm

5. HI, Bart
   I always enjoyed listening to your talks. Is there any way I can get the show notes. Particulalry the series on terminal tips. I often listen to TMUP while I am driving. Thanks for any help-chin

   Comment by chin — September 2, 2008 @ 7:13 pm

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