DNS Load Balancing

Question 1

What are the four types of load balancing?

Answer 1

1) Global Availability
2) Topology
3) Ratio
4) Round Robin

Question 2

Are the following load balancing methods (global availability, topology, ratio, and round robin) considered static or dynamic?

Answer 2

Static

Question 3

What is global availability load balancing?

Answer 3

DNS resolution selection in order of virtual server precedence in a pool.
An example is if NDC_PL is listed as 0 and BDC is listed as 1. NDC would high the higher precedence.

Question 4

What is topology load balancing?

Answer 4

BIG-IP DNS distributes DNS name resolution requests using proximity-based load balancing.

Question 5

What is ratio load balancing?

Answer 5

BIG-IP DNS distributes DNS name resolution requests among the virtual servers in a pool or among pools in a multiple pool configuration using weighted round robin.

Question 6

What is round robin load balancing?

Answer 6

BIG-IP DNS distributes DNS name resolution requests in a circular and sequential pattern among the virtual servers in a pool. Over time each virtual server receives an equal number of requests.

Question 7

What is a fallback IP load balancing?

Answer 7

DNS name resolution requests to a specific user-specified IP address. This IP is not monitored for availability.

Question 8

In the configuration utility, where would you configure the load balancing methods for members?

Answer 8

DNS ›› GSLB : Pools : Pool List
Under the pool members.

Question 9

In the configuration utility, where would you configure the load balancing methods for the wideip?

Answer 9

DNS ›› GSLB : Wide IPs : Wide IP List ›› Pools

Question 10

What is Return to DNS?

Answer 10

BIG-IP DNS immediately distributes DNS name resolution requests to an LDNS for resolution.