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Because of the large volume of requests to link domain names with Internet Protocol numbers, both root zone files and top-level domain zone files are replicated on a number of different computers, thus ensuring both speed and consistency.
The master root server is called the “authoritative root server” or the “A” root server. There are 12 other root servers located worldwide (designated "B" through "M"), and each receives updated information daily from the “A” root server regarding the contents of the root zone file and the top-level domain zone files.