Understanding Domain Name System

    Portlin Admin
    By Portlin Admin

    The Domain Name System (DNS) is essentially a distributed database that translates host names into IP addresses and IP addresses back to host names. That database also contains information related to each domain, such as how the domain is organized into zones, where to route mail for that domain, and who to contact with questions associated with the domain.

    By setting up a DNS server, you become part of a hierarchy of DNS servers that make up the Internet. At the top of this hierarchy is the root server, represented by a dot ("."). Below the root server are the Top Level Domains, or TLDs (such as .com, .org, and so on). Domains that individual organizations own and maintain lie below the TLDs. That's where you come in. 

    Besides using your DNS server to help people from the Internet find the public servers in your domain, you can also use DNS to provide name and IP address mapping for computers on your private network. 

    Determining Goals for DNS Server


    The basic function of a name server is to answer queries by providing the information that those queries request. A DNS name server primarily translates domain and host names into IP addresses. Each domain is typically represented by at least two DNS servers.