Click this check box to enable or disable the Domain Name Server (DNS). You may want to enable DNS because you have DNS servers for mapping IP addresses to host names.
DNS is a distributed database system for managing host names and their associated Internet Protocol (IP) addresses. Using DNS means that people can use names, such as www.jkltoys.com to locate a host, rather than using the IP address (xxx.xxx.xxx.xxx). A single server may only be responsible for knowing the host names and IP addresses for a small subset of a zone, but DNS servers can work together to map all Domain names to their IP addresses. DNS servers working together allow computers to communicate across the Internet.