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DNS High Availability Features

DNS provides features for making itself more available and also features for making applications more available. Caching servers, which contain the same information and are synchronized, can be configured. Multiple IP addresses can be listed for a specific host name in a DNS record. Each time a request is made for that host, the next IP address in the list is handed out. This technique is often referred to as round robin; it is useful when a DNS client is provided with the address of an application server that is not operational because, with the round robin technique, the client will try again and get a different address.

DNS servers can be clustered to provide automatic failover of master servers, although this feature is not part of the architecture. With this technology, updates to DNS records can still be performed in case the master DNS server fails.

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