NEWBIE QUESTION ABOUT DNS

[Stefano Santangelo]

Hi all,
I'm sorry, but mine is a fool question about how DNS work (I'm trying to
understand it....).
I understood (probably...)it is hierarchical, that is to say if I ask my
server for a domain that he's not authoritative for, he ask to "someone
else" (the root server for the .com TLD for instance, which says what is the
name server authoritative for that domain), but it's right this I can't
figure out, how does my name server know the "root server"?

Can anyone help me to undertstand?