Simple DNS question

I have this simple question.

I registered a domain for a client, but entered a wrong primairy DNS server at the registrars records, the secondairy was correct.

All zonefiles were correct setup on the primairy same for the SOA.

After a day orso the domain could be reached, no problems, but suddenly my customers started complaining the server was down (he could not reach his site), i started looking and found out i could not reach it eigther, and then found out about the primairy mistake.

My question; if the secondairy is right there should be no problem reaching the site, or am i wrong about this?

If i'm wrong, why did the problems started after two days instead of right away?

Thanks in advance !

Dutchie

 

 

 

 

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