This MS-900 practice question tests your understanding of describe cloud concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 wants to ensure that their cloud resources can automatically increase during peak traffic and decrease during low usage. They also want to be billed only for the resources they consume. Which two cloud characteristics are described? (Choose two.)
Elasticity enables automatic scaling; measured service enables pay-per-use billing.
B
High availability and Disaster recovery
Why wrong: High availability ensures uptime and disaster recovery restores after failures, but they do not cover automatic scaling or usage billing.
C
Scalability and Fault tolerance
Scalability is the ability to handle increased load (often manual), and fault tolerance ensures system resilience, but not automatic scaling or metered billing.
D
Agility and Resource pooling
Why wrong: Agility means rapid provisioning; resource pooling serves multiple tenants. Neither directly addresses automatic scaling or pay-per-use billing.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Elasticity and Measured service
Elasticity refers to the ability of cloud resources to automatically scale out (increase capacity) during peak traffic and scale in (decrease capacity) during low usage, matching demand in real time. Measured service means that cloud resource usage is metered, and customers are billed only for the resources they actually consume, typically on a pay-per-use basis. These two characteristics directly address the company's requirements for automatic scaling and consumption-based billing.
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.
✓
Elasticity and Measured service
Why this is correct
Elasticity enables automatic scaling; measured service enables pay-per-use billing.
Related concept
Read the scenario before looking for a memorised answer.
✗
High availability and Disaster recovery
Why it's wrong here
High availability ensures uptime and disaster recovery restores after failures, but they do not cover automatic scaling or usage billing.
✓
Scalability and Fault tolerance
Why this is correct
Scalability is the ability to handle increased load (often manual), and fault tolerance ensures system resilience, but not automatic scaling or metered billing.
Related concept
Read the scenario before looking for a memorised answer.
✗
Agility and Resource pooling
Why it's wrong here
Agility means rapid provisioning; resource pooling serves multiple tenants. Neither directly addresses automatic scaling or pay-per-use billing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse scalability (which can be manual or planned) with elasticity (which is automatic and dynamic), and they overlook that measured service is the specific characteristic for consumption-based billing, not resource pooling or agility.
Detailed technical explanation
How to think about this question
Elasticity is often implemented via auto-scaling groups (e.g., AWS Auto Scaling, Azure VM Scale Sets) that use metrics like CPU utilization or request count to trigger scale-out/in actions, with cooldown periods to avoid thrashing. Measured service relies on metering agents that track resource consumption (e.g., vCPU hours, storage GB-months) and report to a billing system, often using APIs like AWS CloudWatch or Azure Monitor for granular usage data. A real-world scenario: an e-commerce site using Azure Autoscale to add VMs during Black Friday traffic and remove them afterward, paying only for the extra compute hours 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
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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: Elasticity and Measured service — Elasticity refers to the ability of cloud resources to automatically scale out (increase capacity) during peak traffic and scale in (decrease capacity) during low usage, matching demand in real time. Measured service means that cloud resource usage is metered, and customers are billed only for the resources they actually consume, typically on a pay-per-use basis. These two characteristics directly address the company's requirements for automatic scaling and consumption-based billing.
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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