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Domain name resolution begins with a query to the Root Domain Servers (a.root-servers.net, b.root-servers.net etc.). To decrease the load on the root servers, two techniques were developed. The first was delegation, the second, caching.

Delegation is the process of referring DNS resolution requests to the Authoritative Server. For instance, InterNIC delegates berkeley.edu to the nameservers at the University of California at Berkeley. More properly, InterNIC delegates authority over the berkeley.edu domain to the University.


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