When a recursive resolver receives a response from a TLD nameserver, that response will direct the resolver to an authoritative nameserver. The authoritative nameserver is usually the resolver’s last step in the journey for an IP address
www.devam.com . root server → .com TLD Server → Authoritative devam.com server → returns www.devam.con record
A common mistake is to associate a DNS zone with a domain name or a single DNS server.