Developing Solutions for Microsoft Azure (AZ-204) Practice Exam

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What is an example of scaling out (horizontal scaling)?

Updating a virtual machine to a larger size
Adding more storage to a virtual machine
Adding more web servers into a web farm
Replicating backups to another region

The correct answer is: Adding more web servers into a web farm

Scaling out, or horizontal scaling, refers to increasing the capacity of a system by adding more instances of resources rather than upgrading existing ones. In this context, adding more web servers into a web farm exemplifies this concept perfectly. By introducing additional web servers, the workload can be distributed across multiple machines, allowing for improved performance and redundancy. This approach is particularly beneficial for handling increased traffic and ensures that the application can accommodate more users without the risk of overloading a single server. In contrast, updating a virtual machine to a larger size and adding more storage to a virtual machine represent vertical scaling, which involves enhancing the capabilities of existing hardware. This type of scaling can lead to limitations, as there is a ceiling to how much a single machine can be upgraded. Replicating backups to another region does not involve increasing active computing capacity but rather focuses on data redundancy and disaster recovery, which aligns with a different operational concern than scaling out.