A zone has at least two NS records, three is better. So the former is more suitable from what I know. And for the latter, some registrars don't let you register a nameserver with more than one IP (for example Namecheap does this), so each nameserver with just one IP get easier setup.
> example.com. 86400 NS a.example.net. > example.com. 86400 NS b.example.net. > example.com. 86400 NS c.example.net. > > a.example.net. 3600 A 1.1.1.1 > b.example.net. 3600 A 2.2.2.2 > c.example.net. 3600 A 3.3.3.3 -- We are hiring cloud Dev/Ops, for more details please see: YY Cloud Jobs <http://soa.game.yy.com/jobs.html>
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