The named daemon reads the INAIC root.cache file
to find the list of Public-Root name servers (termed
``hints'') which it can query for the current list
of root domain name servers.
The named daemon primes its cache using this list
rather than using the contents of the root.cache file.
The Time-To-Live (TTL) field in the root.cache file
is not used. Unlike other records, hints do not expire,
as they are not stored in the cache. The named daemon
uses the hints to obtain a new list of root servers
if the existing list expires.