Microsoft Certified: Azure Fundamentals (AZ-900) Practice Exam

The main function of the Load Balancer in Azure is to distribute VM traffic evenly across multiple instances. This is essential in maintaining the performance and availability of applications by ensuring that no single instance becomes overwhelmed with too much traffic. By distributing traffic, the Load Balancer helps to optimize resource utilization and ensures that users experience less downtime, as it can redirect traffic from overloaded or failing instances to those that are healthy.

When traffic flows into an application deployed on Azure, the Load Balancer monitors the health of each instance and balances the incoming requests accordingly. This means that as user demand fluctuates, traffic can be efficiently managed, resulting in a more resilient service.

In contrast, other options reference functionalities that are not the primary role of the Load Balancer. For instance, while it does help route traffic, it does not specifically deliver traffic based on geographical proximity. The auto-scaling functionality mentioned in another choice relates to adjusting the number of instances based on demand, which is typically managed by other Azure services. URL-based routing is a feature aligned with Application Gateway, not the standard Load Balancer, which primarily focuses on Layer 4 networking.