DNS recursive query and iterative Query

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Differences between iterative query and recursive query

1. recursive query: {one query}

It is a recursive query between the client and the local DNS server. That is, when the client sends a request to the DNS server, if the DNS server itself cannot be resolved, in this case, the user sends a query request to another DNS server until the result is obtained and then transferred to the client.
2. Iterative query; {repeated query}
Generally, an iterative query is performed between DNS servers. If DNS server a cannot respond to DNS server B's request, it will send the IP address of DNS server C to DNS server, so that it can send a request to DNS server C.

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DNS recursive query and iterative Query