understanding DNS

hello

if i had domain.com with DNSs configured to:
ns1.server1.com
ns1.server2.com

ns1.server1.com points domain.com to ns1.server1.com IP
ns1.server2.com points domain.com to ns1.server1.com IP too

if ns1.server2.com is shutdown, will the site still be available?
or just for 50% of the people?

thanks

 

 

 

 

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