Comments on: TMUP 145: Using Mac and Windows together

By: chin

chin — Wed, 03 Sep 2008 00:13:04 +0000

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

By: one1step1

one1step1 — Wed, 27 Aug 2008 22:33:30 +0000

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.

By: Bart Busschots

Bart Busschots — Wed, 27 Aug 2008 22:28:33 +0000

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.

By: typicalmacuser

typicalmacuser — Wed, 27 Aug 2008 16:46:05 +0000

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

By: one1step1

one1step1 — Wed, 27 Aug 2008 15:59:20 +0000

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