Configuration File
Click on the red underlined text to get to the source
... addresses
that will perform the recursive requests. This type of resolver
presumably needs the information in a configuration file, since it
probably lacks the sophistication to locate it in the domain database ...
... a "safety belt" structure of the same form as SLIST,
which is initialized from a configuration file, and
lists servers which should be used when the resolver
doesn't have any local information to guide name server ...
... RRs fails, then the resolver initializes SLIST from
the safety belt SBELT. The basic idea is that when the resolver has no
idea what servers to ask, it should use information from a configuration
file that lists several servers which are expected to be helpful.
Although there are special situations, the usual choice is two of the
root servers and two of the servers for the ...