This MS-900 practice question tests your understanding of describe cloud concepts. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company uses a cloud service where they pay only for the compute hours their virtual machines run. They can increase or decrease the number of VMs instantly based on demand. Which two cloud computing characteristics are demonstrated? (Choose two.)
Why wrong: This characteristic allows users to provision resources without human interaction. While present in most cloud services, it is not specifically demonstrated by paying for hours used and scaling on demand.
B
Rapid elasticity
The ability to quickly increase or decrease the number of VMs based on demand is a direct example of rapid elasticity.
C
Measured service
Paying only for the compute hours used is an example of measured service, where usage is metered and billed accordingly.
D
Resource pooling
Why wrong: Resource pooling refers to the provider's multi-tenant model where resources are shared among many customers. This is not evident from the scenario.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Rapid elasticity
B is correct because rapid elasticity allows the company to instantly increase or decrease the number of virtual machines based on demand, scaling resources up or down automatically. C is correct because measured service ensures that the company pays only for the compute hours their VMs run, with usage metered and billed accordingly.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
On-demand self-service
Why it's wrong here
This characteristic allows users to provision resources without human interaction. While present in most cloud services, it is not specifically demonstrated by paying for hours used and scaling on demand.
✓
Rapid elasticity
Why this is correct
The ability to quickly increase or decrease the number of VMs based on demand is a direct example of rapid elasticity.
Related concept
Read the scenario before looking for a memorised answer.
✓
Measured service
Why this is correct
Paying only for the compute hours used is an example of measured service, where usage is metered and billed accordingly.
Related concept
Read the scenario before looking for a memorised answer.
✗
Resource pooling
Why it's wrong here
Resource pooling refers to the provider's multi-tenant model where resources are shared among many customers. This is not evident from the scenario.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'on-demand self-service' with the ability to instantly scale resources, but on-demand self-service specifically refers to the user's ability to provision resources without provider intervention, not the elasticity of scaling.
Trap categories for this question
Scenario analysis trap
Resource pooling refers to the provider's multi-tenant model where resources are shared among many customers. This is not evident from the scenario.
Detailed technical explanation
How to think about this question
Rapid elasticity is often implemented via auto-scaling groups in cloud platforms like Azure Virtual Machine Scale Sets, which can add or remove VMs based on CPU utilization or custom metrics. Measured service relies on metering at the hypervisor or orchestration layer, tracking vCPU hours and memory usage to generate billing data, typically using tools like Azure Cost Management. In a real-world scenario, a company running a batch processing workload might spin up hundreds of VMs for a few hours and then terminate them, paying only for the exact compute time consumed.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-900 question in full detail.
Describe cloud concepts — This question tests Describe cloud concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Rapid elasticity — B is correct because rapid elasticity allows the company to instantly increase or decrease the number of virtual machines based on demand, scaling resources up or down automatically. C is correct because measured service ensures that the company pays only for the compute hours their VMs run, with usage metered and billed accordingly.
What should I do if I get this MS-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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