What are the functions a Load Balancer can perform, and why we use LB?

Application loadbalancer is user for the Increasing the reliablity and capacity of the application.NLB network load balancer is user for distribute the network traffic over the machines

Following are the functions of load balancer

1) Load balancing: Share the incoming the traffic between the list of servers

2) Availability: Forward traffic only to servers which are up and running

3) Overload Protection: To limit traffic when there is surge in traffic so that backend servers is not overloaded.

A load balancer is device that distribute network or application traffic across the cluster. LB sits in between Client and server, it accept the traffic (Network/application) and distributes is across the backend server using different load balancing methods.

LB is used for increase the capacity and relaibility of the application. They increase the overall performance of the application and decrease load on the backend server by optimizing the session.