How common is lack of DNS server diversity?

Sun Jan 28 02:48:54 UTC 2001

 Ah.. your term "root server" is what I have always called "authoritative"
e.g. any listed master/slave for a zone.

> 
> <Root server> ::= Any DNS server that has final authority for a <domain
> tier/level>;
> <domain tier/level> ::= root, TLD, SLD, 3LD, ... nLD (0LD, 1LD, 2LD, ...
> ,nLD).
> This is not to be confused with root level servers that have specific
> authority for dot, at the root level (0LD).
> 