Question 147 of 1,031

Describe cloud concepts →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is economies of scale, which is the correct choice because Microsoft Azure can leverage its massive global infrastructure to purchase hardware, power, and cooling at significantly reduced per-unit costs, savings that are then passed to customers who commit to longer-term reservations like a three-year instance. This technical concept explains why Azure can offer a lower price than the company’s on-premises cost of $200 per server per month, as the provider’s bulk buying power and optimized resource utilization drive down expenses. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your understanding of how cloud providers achieve cost advantages through scale, often appearing as a scenario comparing on-premises versus cloud pricing with a trap answer like “reserved instances” or “cost management.” A common memory tip is to think of “bulk buying” — just as a warehouse club offers lower prices per item when you buy in volume, Microsoft’s massive data center operations reduce costs through economies of scale, and the reservation commitment simply aligns your usage with their predictable, efficient operations.

AZ-900 Describe cloud concepts Practice Question

This AZ-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 currently runs its application on-premises in a data center. The IT manager calculates that the cost per server per month is approximately $200 when considering hardware depreciation, electricity, cooling, and staff. The company is considering moving to Azure and discovers that Azure can provision the same server capacity for $150 per month, but only if the company commits to a three-year reservation. Which cloud concept best explains why Azure can offer a lower price even with the reservation commitment?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

Question 1mediummultiple choice

Full question →

A
Rapid elasticity
Why wrong: Rapid elasticity describes the ability to quickly scale resources up or down based on demand. It does not inherently explain why a cloud provider can offer compute capacity at a lower price point than on-premises infrastructure.
B
Economies of scale
Economies of scale is the correct concept. Cloud providers purchase hardware, electricity, and bandwidth in massive volumes, reducing their per-unit costs far below what a typical organization can achieve. These savings are passed to customers, even with reserved pricing.
C
High availability
Why wrong: High availability refers to designing systems for maximum uptime through redundancy and failover. While Azure offers high availability, this concept does not explain the cost difference between on-premises and cloud pricing.
D
Measured service
Why wrong: Measured service means that cloud usage is metered and billed based on consumption. It describes how costs are calculated, but it does not explain why the cloud provider can offer a lower base price for compute capacity.

Full breakdown with real-world context →

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

✓

Economies of scale

Azure can offer a lower price for a three-year reserved instance because of economies of scale. Microsoft operates massive, globally distributed data centers that purchase hardware, power, and cooling in bulk, significantly reducing per-unit costs. This cost advantage is passed to customers who commit to longer-term reservations, as the provider can better predict and optimize resource utilization.

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.

✗
Rapid elasticity
Why it's wrong here
Rapid elasticity describes the ability to quickly scale resources up or down based on demand. It does not inherently explain why a cloud provider can offer compute capacity at a lower price point than on-premises infrastructure.
✓
Economies of scale
Why this is correct
Economies of scale is the correct concept. Cloud providers purchase hardware, electricity, and bandwidth in massive volumes, reducing their per-unit costs far below what a typical organization can achieve. These savings are passed to customers, even with reserved pricing.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
High availability
Why it's wrong here
High availability refers to designing systems for maximum uptime through redundancy and failover. While Azure offers high availability, this concept does not explain the cost difference between on-premises and cloud pricing.
✗
Measured service
Why it's wrong here
Measured service means that cloud usage is metered and billed based on consumption. It describes how costs are calculated, but it does not explain why the cloud provider can offer a lower base price for compute capacity.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates confuse 'reservation' with 'reserved capacity' and assume the discount comes from the commitment itself, rather than understanding that the underlying cost advantage is driven by economies of scale at the provider level.

Detailed technical explanation

How to think about this question

Economies of scale in cloud computing are driven by massive procurement discounts (e.g., Azure negotiates with hardware vendors for CPUs, SSDs, and networking gear at 30-50% below retail), optimized power usage effectiveness (PUE) ratios (often 1.1–1.2 vs. typical on-premises 1.8–2.0), and automated management reducing staff overhead. A three-year reservation allows Azure to lock in capacity planning, further lowering operational risk and enabling the $50/month savings per server.

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.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this AZ-900 question test?

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: Economies of scale — Azure can offer a lower price for a three-year reserved instance because of economies of scale. Microsoft operates massive, globally distributed data centers that purchase hardware, power, and cooling in bulk, significantly reducing per-unit costs. This cost advantage is passed to customers who commit to longer-term reservations, as the provider can better predict and optimize resource utilization.

What should I do if I get this AZ-900 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 11, 2026

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