Description: DNS iterative resolution refers to the process where a DNS server returns the best answer it has without consulting other servers. In this model, when a client makes a DNS query, the server that receives the request searches its own database of DNS records. If the server has the requested information, it returns it directly to the client. However, if it does not have the answer, the server does not query other DNS servers to obtain it. Instead, it may return an error message or a partial response, indicating that it does not have the required information. This approach contrasts with recursive resolution, where the DNS server acts as an intermediary and searches for the answer on other servers. Iterative resolution is particularly useful in environments where a quick response is required and where local DNS servers are trusted to have sufficient information to handle most queries. Additionally, this method can reduce network load, as it avoids multiple queries to other servers, which can be beneficial in terms of efficiency and response speed.
