AZ-900 Describe cloud concepts Practice Question
A company runs a development and testing environment on Azure virtual machines. The environment is only needed during standard business hours (9:00 AM to 5:00 PM), Monday through Friday. The IT team configures an automated schedule that deallocates all VMs at 5:00 PM each weekday and starts them again at 8:00 AM the next morning. The team reports a significant reduction in their monthly Azure bill after implementing this schedule. Which essential characteristic of cloud computing does this scenario primarily demonstrate?
⚠ Common exam trap
A common mix-up: candidates confuse 'stopping' a VM (which still incurs compute charges) with 'deallocating' a VM (which stops compute billing), and they may incorrectly associate the cost savings with elasticity or availability rather than the pay-as-you-go pricing model.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Measured service and consumption-based pricing
The scenario demonstrates measured service and consumption-based pricing because Azure charges for VM compute costs only when the VM is in the 'Running' state. Deallocating the VM releases the reserved compute resources, stopping billing for the VM's vCPU and RAM while retaining the disk and other resources. By scheduling deallocation outside business hours, the company pays only for the hours the VMs are actually running, directly reducing costs based on usage.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Rapid elasticity and scaling
Why it's wrong here
Rapid elasticity refers to the ability to automatically add or remove resources in response to changes in demand. While the company could also use autoscaling, the primary benefit demonstrated here is the ability to stop paying for resources when not in use, not dynamic scaling based on load.
When this WOULD be correct
A question describing an e-commerce website that automatically adds more VM instances during a flash sale and removes them when traffic drops, demonstrating the ability to scale resources up and down quickly based on demand.
- ✓
Measured service and consumption-based pricing
Why this is correct
Cloud providers measure resource usage (e.g., compute hours, storage) and charge only for what is consumed. By deallocating VMs during off-hours, the company avoids paying for compute time during those periods, directly leveraging the consumption-based cost model. This is a key advantage of the cloud over traditional on-premises infrastructure, where hardware costs are fixed regardless of usage.
- ✗
High availability
Why it's wrong here
High availability is about ensuring that applications remain accessible and operational during failures (e.g., using redundant VMs across availability zones). The scenario does not involve maintaining uptime during failures; it focuses on cost savings by turning off resources when not needed.
When this WOULD be correct
A scenario where a company deploys VMs across multiple availability zones to ensure the application remains accessible during a regional outage would demonstrate high availability. The question would ask which cloud characteristic ensures minimal downtime.
- ✗
Geographic distribution
Why it's wrong here
Geographic distribution refers to deploying resources in multiple Azure regions to reduce latency for global users or to support disaster recovery. The scenario describes a schedule based on business hours, not deploying resources in different geographical locations.
When this WOULD be correct
A company deploys web servers in three Azure regions to reduce latency for global users. The scenario asks which cloud characteristic this demonstrates; geographic distribution would be correct.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-900 exam frequently reuses these exact scenarios with slightly different constraints.
✓Measured service and consumption-based pricingCorrect answer▾
Why this is correct
Cloud providers measure resource usage (e.g., compute hours, storage) and charge only for what is consumed. By deallocating VMs during off-hours, the company avoids paying for compute time during those periods, directly leveraging the consumption-based cost model. This is a key advantage of the cloud over traditional on-premises infrastructure, where hardware costs are fixed regardless of usage.
✗Rapid elasticity and scalingWrong answer — click to see why▾
Why this is wrong here
The scenario describes cost savings from deallocating VMs during off-hours, which directly relates to paying only for consumed resources (consumption-based pricing). Rapid elasticity and scaling refer to dynamically adjusting resources to meet demand, not scheduling shutdowns to reduce costs.
★ When this WOULD be the correct answer
A question describing an e-commerce website that automatically adds more VM instances during a flash sale and removes them when traffic drops, demonstrating the ability to scale resources up and down quickly based on demand.
Why candidates choose this
Candidates may confuse the automated start/stop schedule with scaling, as both involve changing resource states. However, scaling implies adjusting capacity to handle variable load, not simply turning resources on/off based on time.
✗High availabilityWrong answer — click to see why▾
Why this is wrong here
High availability refers to ensuring services remain operational despite failures, not to cost savings from turning off resources when not needed. The scenario is about reducing costs by deallocating VMs during off-hours, which demonstrates consumption-based pricing, not availability.
★ When this WOULD be the correct answer
A scenario where a company deploys VMs across multiple availability zones to ensure the application remains accessible during a regional outage would demonstrate high availability. The question would ask which cloud characteristic ensures minimal downtime.
Why candidates choose this
Candidates may confuse automated scheduling with maintaining availability, thinking that deallocating VMs at night is a form of availability management, but it's actually about cost optimization.
✗Geographic distributionWrong answer — click to see why▾
Why this is wrong here
Geographic distribution refers to deploying resources across multiple regions for latency or redundancy, not to cost savings from turning off VMs during off-hours.
★ When this WOULD be the correct answer
A company deploys web servers in three Azure regions to reduce latency for global users. The scenario asks which cloud characteristic this demonstrates; geographic distribution would be correct.
Why candidates choose this
Candidates may confuse 'geographic distribution' with any scenario involving time-based scheduling, mistakenly thinking the schedule relates to different time zones or regions.
Analysis generated from the official AZ-900blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Go deeper
Related to this question
Learn chapter
What is Cloud Computing?
Key term
Environment
An environment is a dedicated set of computing resources, configurations, and services used to develop, test, or host software applications in a controlled and repeatable way.
Key term
Consumption-based pricing
Consumption-based pricing is a cloud billing model where you pay only for the resources you actually use, rather than paying a fixed upfront fee.
About these practice questions
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AZ-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-900 exam.