i) Checks the Availability before giving the response
--> BIG IP DNS can check the availability of the server before providing the server IP address in the DNS Response whereas the Normal DNS Server does not have this capability.
--> Normal DNS Server provides the server IP address in the DNS response even the server is not available or down.
ii) Supports Static and Dynamic Load Balancing Methods
--> Normal DNS Server does not have the capability to check the load on the servers before giving the DNS Response. They simply support only round-robin load balancing.
--> BIG IP DNS supports static as well dynamic level load balancing methods.
--> We can configure the BIG IP DNS to provide the server IP address after checking the load on the server by using a dynamic load balancing method.
iii) No need to restart the services for changing the records in BIG IP DNS
--> Normal DNS Server requires restart of services if you perform any modification/changes in the DNS Zone.
--> Most of changes done by using CLI which is prone to errors.
--> Changes on BIG IP DNS Server done using GUI and no need to restart any services for changes/modifications in the DNS Zone.
iv) Does not support stateful applications
--> Normal DNS Server does not support stateful applications as the persistence concept is not present in the Normal DNS Server.
--> BIG IP DNS Server supports stateful applications as well distributed applicated due to the support of persistence.
--> BIG IP DNS Server can provide the server IP address which is near to the client's location that is not possible in Normal DNS Server.
v) Protects from DDOS Attacks
--> Normal DNS Server can only support limited number of queries per seconds and they are vulnerable to DDOS attacks.
--> BIG IP DNS Server can support up to millions of queries per second depends upon the hardware being used.
--> BIG IP DNS Server can provide accelerated DNS resolution by using features such as DNSSEC/DNS Express/ DNS Caching.
Vi) Scalable
--> Normal DNS Server uses the separate load balancer to add more DNS Servers whereas BIG IP DNS has an inbuilt load balancer.
--> Normal DNS Server requires separate firewall which reduces the DNS Performance whereas the BIG IP DNS has an inbuilt firewall.
--> BIG IP DNS Server discards/drops the DNS Queries which does not match the protocol validations.
--> BIG IP DNS Server is more scalable than Normal DNS Servers.
Reference: F5.com,
Md.Kareemoddin,
CCIE #54759
Nice article!
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