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The prefered DNS server for the site is the server which sends the dns zone updates to all the other servers in the site. The primary DNS zone is created on the server and it has the authority to send changes in zone to other servers
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Often, DNS servers that are authoritative, or primary, for specific zones also function as slave, or secondary, DNS servers for other nearby zones. This permits hosts in one zone to gain access to DNS data from those other zones.
A name server is the server component of the Domain Name System (DNS). DNS is one of the two main name spaces on the internet. The most important functions of these DNS servers is translating domain names and host names into corresponding numeric IP addresses.
Querying DNS for the location of the local DCs and GC servers.
top level
Whenever mail servers talk to each other, they look for MX records at the destination's DNS. When a DNS server is setup for a domain and that domain has mail capabilities, their DNS server will have at least one MX record to denote which server handles mail. The root DNS servers for the internet denote the addresses for the SOA (start of authority) DNS servers for a particular domain.
I think you need to research about DNS. Each Domain name services provider will operate and maintain their own DNS systems. We also have INTERNIC (Internet Network Information Center), and they will have responsibility for manage all domain names and DNS servers. Each DNS have capacities to query other DNS Servers when they have requested from another. More detail here: http://ecoupon.io/what-is-dns-domain-name-servers/
DNS Server
DNS Servers
DNS servers
Using reliable DNS servers is crucial to online success, for a regular website owner the most important of them are the name servers which are responsible for the online solution and with a static DNS you can rely on it instead of a random DNS server.