[NTLUG:Discuss] "Back up dns server"?

[m m]

> Date: Wed, 5 Dec 2007 00:30:40 -0600> From: cjcox at acm.org> I'm either confused or just not understanding what the issue is.> Every company with a domain has multiple name servers with different> IP addresses serving up records for their domain.> > 
 
My questions is:
 
How can I have a "back up" (web) server (at location A city) take over the job when the primary web server (at location B city) can not reachable (because of firewall, power down ...) by using same domain name.
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