Adding, Modifying, or Removing DNS
The function of DNS is to resolve hostnames to IP addresses. Without such a service, network users would have to identify a remote system by its IP address rather than by its easy-to-remember hostname.
Name resolution can be provided dynamically by a DNS server, or it can be accomplished statically, using the HOSTS file on the client system. If you are using a DNS server, the IP address of the DNS server is required. DNS server addresses can be entered manually, or they can be supplied through a DHCP server.