DNS :
- DNS stands for Domain Name Server.
- DNS main task is it takes the domain names and converting into IP address.
Types Of DNS :
1.Primary DNS .
2.Secondary DNS.
1.Primary DNS :
- Primary DNS also called as Master server.
- Primary DNS server creates,maintains and updates the information about its Zones.
2.Secondary DNS :
- Secondary DNS also called as Slave.
- Secondary DNS is referred as "Backup Domain Controller".
Difference Between Primary DNS and Secondary DNS :
Primary DNS Server
|
Secondary DNS Server
|
| Primary DNS server also referred as Primary DNS Zone. | Secondary DNS server also referred as Secondary DNS Zone. |
| The primary server will take the data from local files. | The secondary server will take the data from the primary server using ISP or Host |
| If we want to edit the data possible.Because primary DNS supports both read and write operation. | If we want to edit the data it's not possible.Because , Secondary DNS is read-only. |
| When any changes done to data then Primary DNS send a copy of a file to the secondary DNS. | When updates happen to data in primary DNS it will take the modified file copy from the Primary DNS. |
| Many domains have only one Primary DNS server. | Each and every domain have one or more Secondary Domains. |
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Advantages of Secondary DNS:
- Reducing the burden on Primary DNS server.
- Reducing the network traffic.
- The Secondary DNS solves the problem.Even the primary DNS get down.
Disadvantages of Secondary DNS:
- A network traffic will happen when Secondary DNS taking the data from the Primary DNS.
