DNS Failover
If I register domain.com using the name servers dns1.hosting.com, dns2.hosting.com, dns3.hosting.com and dns4.hosting.com (all fictional) - assuming dns1 and dns2 are on seperate networks (not that it matters), if lets say dns1 goes down, will the internet use only dns2,3,4 and not 1? I think this is how the whole internet works with the 13 root servers right? BEcause if one goes down the internet stops querying them and uses the others right? Since there is a 24 hour ttl on the main internet domains, if lets say i visited domain.com at 2pm my isp will remember the name servers for 24 hours, so if a dns server is down will the isp just ignore it?
Thanks
