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What is the DNS root zone and domain?

according to what i have understood so far a root dns servers responds to top level domain name resolution requests. Am i correct ?

And why is it that there are only 13 root servers ?

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Have you seen the Wikipedia article? en.wikipedia.org/wiki/Root_nameserver – Zoredache Jan 26 '11 at 18:41
If you have any questions left after reading these two links we'd be happy to answer them. – Joris Jan 26 '11 at 19:16
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closed as exact duplicate by sysadmin1138♦, jscott, Scott Pack, Sam♦, Mark Henderson♦ Jan 27 '11 at 3:18

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And why is it that there are only 13 root servers ?

UDP DNS messages are limited to 512 bytes. 13 root server ~ 5oo bytes.

according to what i have understood so far a root dns servers responds to top level domain name resolution requests. Am i correct ?

Yes.

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how come 13 root servers ~ 500 bytes ? – user68350 Jan 27 '11 at 8:43
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