dns setting

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The web hosting thread below was started by hamids68 on 2009-06-30 23:52:50:

I am using dedicated server from iweb.com for my site.

manager of my server sets dns

Name Server: NS1.DNSEXIT.COM (has 21,361 domains)
Name Server: NS2.DNSEXIT.COM (has 21,361 domains)

my site is www.iransalamat.com

question is it is better to have dns like this(as example)
ns1.iransalamat.com
ns2.iransalamat.com

or
NS1.DNSEXIT.COM
NS2.DNSEXIT.COM

is correct? I mean that setting making cause problem?

sorry for my poor english

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