Question 834 of 1,031

Describe cloud concepts →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is elasticity. Elasticity is the correct choice because it specifically refers to a cloud system’s ability to automatically provision and de-provision resources in real time to match fluctuating demand, such as the 300% traffic spike described, ensuring you pay only for what you use. Scalability, by contrast, is the capacity to handle growth over time, but it often involves manual or planned expansion rather than the dynamic, on-demand adjustment required here. On the Microsoft Azure Fundamentals AZ-900 exam, this distinction is a frequent trap: many candidates confuse scalability with elasticity, but the key is that elasticity handles unpredictable, short-term bursts while scalability handles long-term growth. A helpful memory tip is to think of “elastic” like a rubber band—it stretches and snaps back automatically—while “scalable” is like building a taller ladder, which takes planning and doesn’t shrink back down.

AZ-900 Describe cloud concepts Practice Question

This AZ-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 retail company experiences fluctuating customer traffic throughout the year. During peak seasons, traffic can increase by 300% for a few weeks. The company wants to pay only for the compute resources it uses, without needing to invest in permanent infrastructure to handle peak loads. Which cloud computing characteristic best supports this requirement?

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
High availability
Why wrong: High availability ensures applications remain operational despite failures, but it does not address paying only for used resources or scaling based on demand.
B
Elasticity
Elasticity allows resources to be dynamically provisioned and de-provisioned in response to changing demand. This directly supports paying only for what is used and avoids over-provisioning for peak loads.
C
Fault tolerance
Why wrong: Fault tolerance maintains system operation during component failures, but it does not relate to cost optimization or scaling to match variable demand.
D
Geo-redundancy
Why wrong: Geo-redundancy replicates data across geographically separate data centers for disaster recovery. It does not provide the ability to scale resources elastically or pay per use.

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

✓

Elasticity

Elasticity is the cloud computing characteristic that allows resources to automatically scale up or down based on demand. In this scenario, the retail company needs to handle a 300% traffic spike during peak seasons without permanently provisioning infrastructure, and elasticity enables dynamic provisioning and de-provisioning of compute resources to match the fluctuating load, ensuring they pay only for what they use.

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.

✗
High availability
Why it's wrong here
High availability ensures applications remain operational despite failures, but it does not address paying only for used resources or scaling based on demand.
✓
Elasticity
Why this is correct
Elasticity allows resources to be dynamically provisioned and de-provisioned in response to changing demand. This directly supports paying only for what is used and avoids over-provisioning for peak loads.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Fault tolerance
Why it's wrong here
Fault tolerance maintains system operation during component failures, but it does not relate to cost optimization or scaling to match variable demand.
✗
Geo-redundancy
Why it's wrong here
Geo-redundancy replicates data across geographically separate data centers for disaster recovery. It does not provide the ability to scale resources elastically or pay per use.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse elasticity with high availability, thinking that keeping services running during spikes is the same as scaling resources, but high availability ensures uptime, not dynamic capacity adjustment.

Detailed technical explanation

How to think about this question

Under the hood, elasticity in Azure is often implemented via Virtual Machine Scale Sets (VMSS) with autoscale rules based on metrics like CPU utilization or queue depth, or via Azure App Service autoscaling. A subtle behavior is that scaling out (adding instances) is near-instantaneous, but scaling in (removing instances) respects cooldown periods and graceful shutdown policies to avoid disrupting in-flight requests. In a real-world scenario, a retail company might use Azure Functions with consumption plan to automatically handle traffic bursts without any manual intervention, paying only for execution time.

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.

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: Elasticity — Elasticity is the cloud computing characteristic that allows resources to automatically scale up or down based on demand. In this scenario, the retail company needs to handle a 300% traffic spike during peak seasons without permanently provisioning infrastructure, and elasticity enables dynamic provisioning and de-provisioning of compute resources to match the fluctuating load, ensuring they pay only for what they use.

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.

About these practice questions

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Same concept, more angles

2 more ways this is tested on AZ-900

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A company runs a nightly data processing job that requires high CPU usage for only 15 minutes. During the day, the compute resources are idle. The company wants to reduce costs by automatically starting compute resources only when the job runs and shutting them down after completion, without manual intervention. Which cloud computing characteristic directly meets this requirement?

medium

A.High availability
✓ B.Elasticity
C.Fault tolerance
D.Scalability

Why B: Elasticity is the cloud computing characteristic that enables resources to be automatically provisioned and de-provisioned in response to workload demands. In this scenario, the nightly job requires high CPU for only 15 minutes, and elasticity allows the compute resources to scale up exactly when the job starts and scale down to zero after completion, eliminating idle costs without manual intervention.

Variation 2. A company wants to increase the number of virtual machines it uses during peak hours and decrease them during off-peak hours without manual intervention. Which characteristic of cloud computing does this represent?

easy

A.High Availability
✓ B.Elasticity
C.Scalability
D.Load Balancing

Why B: Elasticity is the cloud characteristic that allows resources to automatically scale out (increase) during peak demand and scale in (decrease) during off-peak hours without manual intervention. This matches the company's requirement for dynamic, automatic adjustment of virtual machine counts based on workload changes.

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