Duplication and Distribution of Zones
DNS is distributed in one other way. Because DNS is so vital to the Internet, it has been designed to be redundant. For each zone, several servers exist. When one server breaks down, the other servers for that domain will still be capable of answering queries about that zone on their own. All a subdomain's authoritative servers are listed in the domain above it. When your computer tries to find an address from a name, it has many alternative servers to query at each step in the process. If one server fails to answer within a set timeout, another will be queried. If they all fail then the query will fail and not return any result. The redundancy not only ensures robustness against failures, it also provides ...
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