Zephyr Professional Practice Test

Which non-functional requirement relates to the scalability of cloud services?

1. Performance in user load

2. Speed of data recovery

3. Number of concurrent users and managed workloads

4. Level of service reliability

The correct answer is: Number of concurrent users and managed workloads

Scalability in the context of cloud services refers to the ability of a system to handle a growing amount of work or its potential to accommodate growth by adding resources. The correct answer emphasizes the number of concurrent users and managed workloads, which directly relates to how effectively a cloud service can expand to meet increasing demands. As user numbers rise or as more tasks are required to be processed simultaneously, scalability ensures that the service can adjust its resources dynamically, whether by scaling up (adding more power to existing resources) or scaling out (adding more resources altogether). The other options, while relevant to overall cloud service performance, do not specifically target scalability. Performance in user load refers to how well the system performs under different levels of user activity but does not encompass the broader capability to grow resource allocation. Speed of data recovery is crucial for disaster recovery and data integrity but is more about resilience than scalability. Level of service reliability pertains to the availability and stability of the service, which is important but does not specifically address the system's capacity to scale in response to user demand.