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

What service allows you to scale applications and create high availability?

1. Availability Zone

2. Load Balancer

3. Azure Virtual Network (vNet)

4. Resource Group

The correct answer is: Load Balancer

The Load Balancer is the correct answer because it is specifically designed to distribute incoming network traffic across multiple servers or instances of an application. This distribution of traffic enhances the reliability and availability of applications by preventing any single server from becoming a bottleneck or point of failure. When there is a high volume of requests or a server goes down, the Load Balancer directs traffic to healthy instances, ensuring that users experience minimal disruption and that the application can effectively adapt to varying loads. While Availability Zones are essential for ensuring high availability through redundancy across different physical locations, they do not inherently offer scaling capabilities. An Azure Virtual Network (vNet) is important for creating isolated networks and enabling communication between Azure resources, but it does not provide application scaling or load distribution. Resource Groups are a way to manage and organize Azure resources, but they don't directly relate to scaling or availability for applications.