Having spoken to a my existing hosting company and the one I'm thinking or using as well, they are unconvincing vague on this.
Please correct me if I'm wrong, but my understanding is :-
a domain name can have a number of named servers and for the purpose of this we will have two
each of these has a different ip address
my virtual site exampel.com has the two above named servers.
When someone types in example.com and everything is going well they will get directed to the primary named server ns.somewhere.com
If ns.somewhere.com goes down for any reason (DOS attack?) then when someone types in example.com it can't find it at ns.somewhere.com so it goes to ns.anotherplace.com
In my mind that's how it should work but I have a nagging suspicion that there may be something I'm missing like for instance when I ping a web address I get the ip of the primary server
Your thoughts would be appreciated