when does bind or dns in general use tcp and when does it use udp?

from what i have read, from the client intial request if under 512b come in on 
UDP port 53, if and depending on the local
resolver in needs to retry it *could* be a tcp port 53 request?

now thats client to name server;


what about, recursive lookups? or forwarded requests? etc 


how does that work?




-Nex6


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