Reliability
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... network connectivity exhibited by the set
of DNS servers for a zone can increase the reliability of that zone
as well as improve overall network performance ...
... performance and access
characteristics. Other considerations in server choice can
unexpectedly lower reliability or impose extra demands on the
network.
...
... addresses which
most of the network cannot reach does not add any reliability, and
causes several problems, which may, in the end, lower the reliability
...
... network cannot reach does not add any reliability, and
causes several problems, which may, in the end, lower the reliability
of the zone.
...
... firewall is blocking
this access. All of this additional load does no more than
effectively lower the reliability of the service.
...
... organisation level zones, with at least one which must be well
removed from the others. For zones where even higher reliability is
required, four, or even five, servers may be desirable. Two, or
occasionally three of five, would be at the local site, with the
...