Performing Iterative Queries
Iterative queries ask a DNS server to either resolve the query or make a best-guess referral to a DNS server that might contain more accurate information about where the query can be resolved. Another iterative query is then performed to the referred server and so on until a result, positive or negative, is obtained.
In the example shown in Figure 10.11, Client1 in CompanyABC opens a web browser and attempts to browse to the website for www.microsoft.com. A recursive query is initiated to the default name server; in this case, Server1 is contacted. Because Server1 is authoritative only for the companyabc.com namespace, and no entries exist for microsoft.com, the query is sent to an “upstream” DNS server that is listed ...
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