Apedia

Server Query Inquiring Level Dns Types Iterated Resolves

Front DNS: types of queries (2)
Back Iterated Query
The inquiring server resolves the domain "bit by bit"; Each receives the DNS server a level deeper in the Hirarchie and then makes a new request.

Recursive Query
The inquiring server asks the root server for the complete resolution, which then contacts the server one level lower, this is recursively continued and the answer is finally passed upwards.

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