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Why would a System Administrator use UDP instead of TCP for DNS queries when TCP is more reliable?
UDP has faster queries because the DNS server does not have to keep track of any connections; as opposed to TCP that uses 2 responses for each query.
TCP does not keep track of the connections that are made which makes UDP more suitable for all DNS queries.
UDP has more reliability with its connection which gives the DNS query a faster connection and transmission speed.
None of the these
It is one round trip time for the query and response for UDP, as opposed to 2 for the TCP case because you have to set up the connection first. Being connection-less means that the server can be much more efficient, because it never has to keep track of any connections or state. And you just re-transmit if you don't get an answer. TCP isn't really loss-less, it just guarantees that you know when you've lost something which is an important distinction. And with DNS, that is rather easy; you did not get your answer. TCP would take a while to figure this out; with UDP you can pick your timeout.
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