Recursive QUERY: This name queries are generally made by a DNS client to a DNS server or by a DNS server that is configured to pass unresolved name queries to another DNS server, in the case of a DNS server configured to use a forwarder.
Iterative Query: An iterative name query is ONE in which a DNS client allows the DNS server to return the best answer it can give based on its cache or zone data. If the QUERIED DNS server does not have an exact match for the queried name, the best possible INFORMATION it can return is a REFERRAL. The DNS client can then query the DNS server for which it obtained a referral. It continues this process until it locates a DNS server that is authoritative for the queried name, or until an error or time-out condition is met.

Recursive Query: This name queries are generally made by a DNS client to a DNS server or by a DNS server that is configured to pass unresolved name queries to another DNS server, in the case of a DNS server configured to use a forwarder.
Iterative Query: An iterative name query is one in which a DNS client allows the DNS server to return the best answer it can give based on its cache or zone data. If the queried DNS server does not have an exact match for the queried name, the best possible information it can return is a referral. The DNS client can then query the DNS server for which it obtained a referral. It continues this process until it locates a DNS server that is authoritative for the queried name, or until an error or time-out condition is met.