Microsoft Azure Architect Technologies (AZ-300) Practice Exam

Defining the instance size and number of instances is a crucial action when configuring a VM scale set because VM scale sets are designed to provide high availability and scalability for applications. By specifying the instance size, you ensure that each virtual machine within the scale set has the appropriate amount of resources (CPU, memory, etc.) to handle the workload. Additionally, defining the number of instances allows you to control how many VMs are deployed to handle traffic and workloads, facilitating automatic scalability based on demand. This configuration is fundamental to effectively utilize the capabilities of VM scale sets, which are meant to manage and provide scaling of multiple VMs in unison. While setting up firewalls, creating backups, and deploying ARM templates are important considerations in the broader context of Azure infrastructure management, they are secondary to the operational parameters required to initially set up and configure a scale set for performance and scalability. These aspects can play a part in a holistic strategy, but they do not directly pertain to the initial configuration of a VM scale set where sizing and instance count take precedence.