nameservers setup question

Hello.

I have a question regarding the setup of nameservers.
I know it is a simple Q to many of you, but its sure confusing me.

I registered nameservers to be used for my dedicated server as follows:

ns1.example.com --->IP ending in 100
ns2.example.com --->IP ending in 101

(IPs supplied by company)

First Q: is that correct OR they should both end in 100 (used as example)

I then had example.com dns' changed to
first entry: ns1.example.com
second entry ns2.example.com

I am asking as I have added a new domain in WHM but it still doesnt resolve after over 48 hours, yet on my old VPS, when I change dns for a domain, it shows up in less than 24 hours.

ANY help will be *very* much appreciated!

Thank you!

 

 

 

 

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