Cross zone load-balancing is an extremely useful tool launched by AWS in its load-balancing utility subsection. As the name suggests, cross zone load-balancing enables load distribution on all servers across ALL availability zones. If cross zone is disabled, the load distribution will only take place in the respective availability zones of the load balancers.
While this may be okay in some cases, it will lead to poor traffic distribution in other cases. Let me demonstrate with examples.
Case 1: Without a cross zone load balancer
Case 2: With a cross zone load balancer
I hope the explanation is clear now!
You can watch an on-screen demo of the same here :