Final answer:
Cross-zone load balancing in ELB evenly distributes incoming traffic across multiple availability zones in AWS, improving performance and reliability.
Step-by-step explanation:
Cross-zone load balancing in Elastic Load Balancing (ELB) is a feature that distributes incoming traffic evenly across multiple availability zones in Amazon Web Services (AWS). It helps improve the overall performance and reliability of applications by ensuring that no single availability zone becomes overloaded.
With cross-zone load balancing, ELB takes into account the capacity of the instances in each availability zone and distributes traffic accordingly. For example, if one availability zone has more instances than the others, ELB will allocate a higher proportion of the traffic to that zone.
This ensures that the workload is balanced across multiple availability zones, minimizing the risk of a single point of failure and providing better fault tolerance for applications hosted on AWS.