2 types of DNS query :
iterative querry : This query will be the correct DNS name or the possible next step for a server to contact for the resolution.The server will try to find the actual DNS name by doing the trial and error till it gets the result or an error
Recursive querry : usually client ask the server or a server ask to its Forwarder. Here the only option is to give the resolved IP address or showing an error if it doesn’t find an answer .It will not try an another step to get the result
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