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 needs to burst compute capacity during a seasonal sale event. They plan to use Azure virtual machines to handle the extra load and then release them after the event. They want to pay only for the extra resources used during that period. Which cloud characteristic best describes this?
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.
Correct. Elasticity enables rapid scaling out (adding resources) during high demand and scaling in (removing resources) afterward, with consumption-based billing.
B
High availability
Why wrong: Incorrect. High availability focuses on uptime and resilience against failures, not on the ability to scale temporarily for peak loads.
C
Geo-redundancy
Why wrong: Incorrect. Geo-redundancy replicates data across multiple geographic regions for durability and disaster recovery, not for handling bursty workloads.
D
Agility
Why wrong: Incorrect. Agility refers to the ability to quickly provision and configure resources, but the specific characteristic of scaling out and in per demand is elasticity.
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 characteristic that allows resources to automatically scale up to meet increased demand and scale down when demand decreases, ensuring you only pay for what you use. In this scenario, the company needs to burst compute capacity for a seasonal sale event and then release the VMs afterward, which is a textbook example of elasticity. This contrasts with other characteristics like high availability or geo-redundancy, which focus on uptime and data replication rather than dynamic scaling.
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
Why this is correct
Correct. Elasticity enables rapid scaling out (adding resources) during high demand and scaling in (removing resources) afterward, with consumption-based billing.
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
Incorrect. High availability focuses on uptime and resilience against failures, not on the ability to scale temporarily for peak loads.
✗
Geo-redundancy
Why it's wrong here
Incorrect. Geo-redundancy replicates data across multiple geographic regions for durability and disaster recovery, not for handling bursty workloads.
✗
Agility
Why it's wrong here
Incorrect. Agility refers to the ability to quickly provision and configure resources, but the specific characteristic of scaling out and in per demand is elasticity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse elasticity with high availability, mistakenly thinking that adding more VMs for a burst is about keeping the system up, rather than understanding that elasticity is specifically about dynamic scaling to match demand and optimize cost.
Detailed technical explanation
How to think about this question
Elasticity in Azure is implemented through features like Virtual Machine Scale Sets (VMSS) and Azure Autoscale, which can automatically increase or decrease the number of VM instances based on metrics such as CPU utilization or a scheduled time window. Under the hood, Azure Resource Manager orchestrates the provisioning and deallocation of VMs, and billing is metered per second for the actual runtime of each instance. A real-world scenario where this matters is an e-commerce platform using VMSS to handle Black Friday traffic, where failing to scale down after the event would incur unnecessary costs.
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 AZ-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 — Elasticity is the cloud characteristic that allows resources to automatically scale up to meet increased demand and scale down when demand decreases, ensuring you only pay for what you use. In this scenario, the company needs to burst compute capacity for a seasonal sale event and then release the VMs afterward, which is a textbook example of elasticity. This contrasts with other characteristics like high availability or geo-redundancy, which focus on uptime and data replication rather than dynamic scaling.
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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.