DNS Basic Name Resolution Techniques: Iterative and Recursive Resolution
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DNS Name Resolution Techniques
The DNS standards actually define two distinct ways of following this hierarchy of servers to discover the correct one. They both eventually lead to the right device, but they differ in how they assign responsibility for resolution when it requires multiple steps.
When a client sends an iterative request to a name server, the server responds back with either the answer to the request (for a regular resolution, the IP address we want) or the name of another server that has the information or is closer to it. The original client must then iterate by sending a new request to this referred server, which again may either answer it or provide another server name. The process continues until the right server is found; the method is illustrated in Figure 243.
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