Sequence of nameservers

A quick query - say you have a domain (domain.com) and nameservers ns1/ns2/ns3/ns4.domain.com , each in a different country (for redundancy)

and the nameservers are listed in the same sequence at the registrar.

is there any specific sequence in which an end user/isp accesses the nameservers? i.e is ns1 checked first then ns2 then ns3 and then ns4 or is it a random order or is there any other method to the sequence?

Thanks

 

 

 

 

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