Primary DNS vs Secondary DNS

	Primary DNS	Secondary DNS
Type	Authoritative server	Backup DNS server
Also called	Master server	Slave server
Function	Directly obtain data from local files.	Recieves all zone files from primary server and makes a copy.
Number in given zone	One	Many
Additional tasks	Modifications or additions to Resource Records in given zone.	Load balancing,fault tolerance,traffic reduction
Acts as	Main master server for all tasks.	Backup server for primary server when later fails.
Behavior	Non-routable IP addresses.	Routable IP addresses.