The example shown in project DNS iterative query makes use of both recursive queries and iterative queries. The query sent from cis.poly.edu to dns.poly.edu is a recursive query, since the query asks dns.poly.edu to obtain the mapping on its behalf. But the subsequent three queries are iterative since all of the replies are directly returned to dns.poly.edu In theory, any DNS query can be iterative or recursive. For example, the animation above shows a DNS query chain for which all of the queries are recursive. In practice, the queries typically follow the pattern of DNS iterative query .The query from the requesting host to the local DNS server is recursive, and the remaining queries are iterative.

Resourse:https://media.pearsoncmg.com/bc/abp/cs-resources/products/series.html#series,series=Kurose

Creative graphics and animations are included to provide concept of the DNS query.