If there is a list of NS records, the local name server uses the RTT (round
trip time) algorithm to find the fatest, and queries that server.
But I found it's not right. In the testing, the local name server doesn't query
the fastest authority name server. Some one tells me that if the local name
server gets the RTT to one remote server is les than 30ms, it will not test RTT
to other remote servers, even if the RTT is more less. In other words, the
local server will only query the first remote server with the RTT less than
30ms. Who would tell me the truth? Thanks! Guanghua
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