Why doesn't ISP provide the DNS ?

Since the days of slak-3 I don't remember having any problems with
'can't resolve URL' errors.
I'm slowly 'installing' a 2.6*kernel [Debian-Lenny-2009] and every
new app. is problematic. "Just do A, B, C" is a crappy explanation,
simlar to read the `cat man * | ws -l` = 3427 line manual.

I want to better understand what's actually happening.
If I can get out on ppp, to my ISP, then why doesn't the ISP
handle the DNS ? Not directly, but it would know where the
nearest/best DNS is ?

When you debug something, it's best to understand the
stages that the process goes through, so that you can test at these
critical stages.

Let me take a wild guess: when I `wget <URL>`:
1. some utility must searchy some file to decide which DNS to use;
I'd like to see a 'trace' of that file being read.

2. and then I'd like to see a trace of the next stage.

Can someone help me to understand what happens 'under the hood''?

== TIA.

.

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