> > False. The caching system means that the roots don't pay per query; > > they pay per cache miss--and the number of cache misses is going to be > > roughly proportional to the number of TLDs. > > The number of cache misses will be in relation to the frequency at which > queries arrive versus the TTL for the TLD's authoritative servers. The > number of TLDs is completely irrelevant. the latter statement is false, because the more TLDs there are, the more potential cache misses for some TLD (thus requiring a query to a root server) at any resolver.