multiple dns servers ?

CNAME Entries etc have to exist on many servers else the system wouldn't work. The original entry will be on one "server" which is seen as authoritive. It is then propagated to other peered servers, and from them to their peers and so on until every ISP on the planet's DNS servers have that record or a forward link to a server that does.

I put servers in "s as although they have a single IP they're often not a single machine but a cluster of machines when you get to larger ISPs core network level.
 
You can get away with running on a single authoritive server but ideally you should have it on at least 2 servers, on ideally more than 1 network.

However, I used to run mine over my ADSL line in 2 different IP ranges and they ran fine. Wouldn't trust it in the slightest for production use but for me and my throwaway test domains it worked a treat.
 
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