Basic introduction
DNS is the abbreviation of Domain Name System and is a core service of the Internet. As a distributed database that can map domain names and IP addresses to each other, it allows people to access the Internet more conveniently without having to remember IP strings that can be directly read by machines.
The resolver, or in the case of another DNS server recursively represented by the resolver, negotiates the use of the recursive service, using the query header bits.
Resolution usually requires traversing multiple name servers to find the required information. However, some resolvers function more simply to communicate with just one name server. These simple resolvers rely on a recursive name server (called a "stub resolver") to do the work for them to find information.
it works
Useful
Useful