browser will first check local hosts file whether it has the rules of this domain. If yes, directly use ip address from local hosts file;
a DNS resolver queries a DNS server that provides a record either for which the server is authoritative, or it provides a partial result without querying other servers.
In a recursive query, a DNS resolver queries a single DNS server, which may in turn query other DNS servers on behalf of the requester. For example, a simple stub resolver running on a home router typically makes a recursive query to the DNS server run by the user's ISP.
