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For example, when we connect to www.example.com, at first we try to connect to 192.0.2.1. And if first try fails, then we try 192.0.2.222.
Is it possible? Can we register multiple backup IP addresses for one domain name?
This is round robin DNS. This is a quite simple solution for load balancing. Usually DNS servers rotate/shuffle the DNS records for each incoming DNS request. Unfortunately it’s not a real solution for fail-over. If one of the servers fail, some visitors will still be directed to this failed server.