AWS Certified SysOps Administrator Practice Exam 2025 - Free SysOps Administrator Practice Questions and Study Guide

Scaling horizontally in AWS refers to the strategy of adding more instances to handle increased load effectively. This approach allows an application to distribute its workload across multiple servers or instances, which can help in managing higher traffic without a single point of failure. By adding additional instances, you can improve the application's availability and redundancy, ensuring that if one instance goes down, others can take over the load seamlessly.

This method is particularly beneficial in cloud environments where resources can be dynamically provisioned. As demand increases, new instances can be launched, and as demand decreases, instances can be terminated to save costs.

In contrast, the other options focus on different aspects of resource management. Increasing the size of existing instances refers to vertical scaling, which involves enhancing the capacity of a single instance rather than spreading the load across multiple instances. Utilizing more storage capacity pertains to data management rather than the capacity of computation resources. Reducing instance size for cost savings likewise does not address the concept of scaling but rather focuses on economizing by minimizing resource consumption.