Domain Name Servers
(DNS) are the Internet's equivalent of a phone book. They maintain a directory
of domain names and translate them to Internet Protocol (IP) addresses.
This is necessary
because, although domain names are easy for people to remember, computers or
machines, access websites based on IP addresses.
The Internet however,
is really based on IP addresses. Every time you use a domain name, therefore, a
DNS service must translate the name into the corresponding IP address.
For example, the
domain name www.example.com might
translate to 198.105.232.4.
| Primary DNS Server | Secondry DNS Server |
|---|---|
| A primary server has the original copy of a zone file | A secondary server gets a copy of zone files from another server |
| The primary server is the authoritative server for the zone | Secondary servers are backup DNS Servers |
| Its Read/Write | Its Read/Only |
| One DNS server can have only one primary DNS server | There can be up to Multiple secondary DNS server |
| Primary server is known as Master server | Seconadry server known as Slave server |