[dns-operations] difference between several NS with several glue

[Yonghua Peng]

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


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