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In a DNS transaction where the querying system generates a recursive query, the client is asking its designated DNS server to resolve a domain name on its behalf, expecting the server to take full responsibility for obtaining the needed information, even if it requires querying other DNS servers in a series of steps.

When a DNS client sends the server name, such as www.adatum.com, to its designated DNS server for resolution, it is initiating a recursive query. The client expects the server to either provide an answer directly from its own records or to look up the information by communicating with other DNS servers if necessary. This means that the server must handle all the details of the resolution process and return the final result to the client.

Other scenarios presented do not involve the client generating a recursive query. For instance, a zone transfer is specifically a process where a DNS server transfers data from one DNS server to another, usually for the purpose of updating or synchronizing DNS records and does not involve client requests. A DNS server responding to an iterative query signifies that the server is providing information based on its own records or guiding the client to the next server, but it does not involve taking on the overall resolution responsibility like a recursive query does. Lastly, when a client queries one of its