on 7/30/2002 10:59 AM Keith Moore wrote:
in general, the more popular TLDs you have, the more load you get on the
root servers from cache misses on the NS records for those TLDs.
(seldom-used TLDs don't count because hardly anybody every queries them...)
OTOH, TLDs that are popular get cached and stay that way.
The real mitigating factor is the number of agents and queries-per-second,
and that doesn't seem to be at risk of exponential growth anytime soon.
In general you are right, but in practical terms, there isn't much
difference between 20, 200 or 2000 TLDs, as long as they don't also
introduce, say, a billion phones to the service network.
and *someone* has to decide which TLDs are "handed out".
Pull-side economics can make this decision. If people think there are
sustainable markets for .auto and .car then there's no reason not to let
them both out of the bag.
The really hard policy matters are things like deciding how delegations
should be preserved if one or both of those go under.
otherwise anyone
could have a vanity TLD, the DNS would collapse to a flat space, and the
root servers would have to handle all queries.
That assumes obtaining a TLD would be simple and cheap, which it shouldn't
be. High fees, escrow, etc., should keep that from happening.
--
Eric A. Hall http://www.ehsco.com/
Internet Core Protocols http://www.oreilly.com/catalog/coreprot/