>> Last time I checked, ISDN is point-to-point only
> 
> So is TCP.  It's connection-oriented, except for the D-channel, which is 
> datagram oriented.

My point being, ISDN lets you put a cable between two nodes. If you want 
to talk to a different node, you have to plug in a different cable.

>>>> Sure, you don't usually talk to them directly; usually you use one 
>>>> of the IP addresses from the block assigned to your ISP.
>>>
>>> Ding ding! Guess what? They aren't assigned centrally. Your ISP 
>>> assined you yours, mine assigned me mine.
>>
>> And where does the ISP get their IP block from?
>>
>> Yeah, exactly: They're assigned centrally.
> 
> Nope. They're assigned heirarchically. That's completely different.

I don't see how...

-- 
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