Difference betwween Primary and Secondary DNS servers: An insight
DNS is an abbreviated term used for Domain Name System, it is the largest database across the world which holds the registration information about every active domain name over the world wide web. Many webmasters also refer a DNS server as Name Server. The information present within the domain name system includes but isn’t limited to the information related to the web host, the domain registrant, and the active name servers for the domain. JPstream offers a minimum of two name servers, it enables the website to send and receive information to-and-from the web.
The concept behind Name Servers
Thousands of DNS servers are situated at nations across the globe. They all hold some portion of database of the domain name system. For maintaining redundancy and security of this database there are thirteen root DNS servers that hold the complete information of the database on every server.
Two main types of DNS servers primary exist, namely the Primary DNS servers and the Secondary DNS servers. Though any web server can be used as a DNS server similarly any DNS server can be used as a primary or secondary server. The server administrator can opt between the choices of using a server as primary or secondary server. Moreover, it is also allowed to use a single server as a primary server in a zone and as a secondary server in another zone.
What Are Primary DNS Servers?
The primary DNS server carries out the responsibility of reading the information regarding a domain zone from a file which is stored on the web server of a hosting package. It is the responsibility of the primary server to communicate with the secondary DNS server, and this process is called the zone transfer due to the basic fact that the zone data is exchanged between DNS servers. Every domain-name is assigned to the DNS servers for the purpose of achieving redundancy and for simplifying the process of server administration. Incase the primary server holds the zone data about a particular domain name, then that data isn’t required to be replicated as the primary and secondary server share zone data on a continuous basis between each other. In simple terms, when a request is made to the server it passes via. primary DNS server which then allocates functions to the secondary DNS server.
What Are Secondary DNS Servers?
The secondary DNS server is referred as the Slave server. It carries out the task of taking data from the primary DNS server instantly as it is set-up.
A minimum of two authoritative name servers are essential for every DNS domain, so at least one secondary nameserver should be configured. The secondary or slave DNS download or copies information for the domain from the primary server and provides answers to the queries about that domain periodically. A certain time frame is set on how long the secondary nameserver can continue answering the queries when it cannot contact the primary. Despite the fact that a secondary nameserver automatically copies its information from the primary, the DNS does not differentiate between primary and secondary nameservers. More-or-less, they are used equally whenever a domain name lookup is performed. These Secondary servers are equally necessary as the primary DNS servers. Mitigation of the load over the primary DNS server is handled by the Secondary servers as well.
(Source: jpstream.net)
