[e2e] node addresses vs. interface addresses

[Roop Mukherjee]

Can someone address this question that someone from theoretical computer 
science asked me:

Why do IP interfaces have addresses not the nodes themselves? Is there an 
architectural reason for this?

I thought since people here seem to have a better perspective of the 
history of IP than I do, I thought that I should pass the query along.

Thanks,
-- Roop
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www.shohin.uwaterloo.ca/~bmukherj