[vcf-midatlantic] Greenbar printout DONE!

Dave McGuire mcguire at neurotica.com
Mon Mar 1 18:44:11 UTC 2021

On 3/1/21 7:23 AM, Neil Cherry wrote:
>>> I took a course on networking (having worked in networking for about 
>>> 20 years at that point) and
>>> the course described switching hubs as routing packets. I went a bit 
>>> nuts on the professor for
>>> the double whammie (it was on a test).
>>    The guy did that to you on a test?!  Wow what a dick.
>>    Yep.  Someone who doesn't know any better could be forgiven for 
>> thinking that switches "route" packets to the appropriate port, 
> Switches switch frames. I couldn't bare to bring myself to replace 
> switch with "route". Not after
> arguing with a CCIE about OSPF exchanging routing information.

   There's a fine line between terminological correctness and "accepted 
usage".  The weird thing (well, weird to me I guess, but I suppose it 
makes sense) is that the latter eventually turns into the former!

> At least he got up to ARP correct.

   Well that's something.

>> which they do.  But, we draw a distinction between routing and 
>> switching, because they happen at different layers of the dip.
>>    Just like someone could be forgiven for thinking "broadband" is 
>> "bandwidth that is broad" and thus has something to do with 
>> transmission speed.
>>    But, in my lifelong study of becoming the absolute best a**hole 
>> that a man can be, I forgive neither. ;)
> Routers route packets (L3), although they can switch packets now, which 
> is a bit disconcerting but
> technical correct.
> Switches switch frames (L2).
> Frames contain packets.

   Yup.  Unless you're working with raw Ethernet, not in the context of 
IP or even the seven-layer reference model, and datasheets for Ethernet 
MAC ICs frequently refer to frames as packets.  So, definition depends 
on context...making it even worse.

> Let's skip vlans for now. they just make my brain ache more. ;-)

   VLANs sure are nice, though.

> When talking* (hehe) network engineering, being this pedantic is a 
> requirement.
> * - Sorry, about the poor English. It was meant as humor. But many of 
> engineering
> discussions bordered on text book bad English while arguing about 
> correct terminology.

   True, but speaking only for myself, I really only care about 
engineering. :)


Dave McGuire, AK4HZ
New Kensington, PA

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