PUBLIC DNS for DR Site

Hi Expert,

i having a customer which host their own domain name, there are Nameserver 1 and nameserver 2,aka NS1 and NS2, and they hosted thier own exchange server as well.

Right now, they having a DR site, which have passive Exchange server, which just replicate the database.

If they plan to setup a new NS3 server at DR site, what could be the advise? should i replicate it from primary DNS or i should setup the standalone NS3.

NS1 = ISP A,  NS2=ISP B,  NS3 =ISP C
Alfred LimAsked:
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MaheshArchitectCommented:
secondary zone server have dependency on primary zone dns server and if not received updates / contacts in 24 HRS, zone copy get expired, this is true in case of windows dns servers
Maintain standalone zone copy at each ISP to avoid dependency on primary zone server
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