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dns-redundancy

- DNS Caching [ feature ]
- DNS fault tolerance [ feature ]
- DNS Server [ object ]

- Secondary DNS Server [ measure ]

Comment:: multiple name servers can exist for every zone
Comment:: one of the key aspects required to make DNS work globally
Comment:: minimum of two DNS servers is needed for each domain
purpose: if one fails, others can handle the requests

References:

http://www.dummies.com/WileyCD...Article/id-1699.html