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 startup expects rapid growth and wants its cloud infrastructure to automatically add or remove compute resources based on real-time demand without manual intervention. Which cloud characteristic does this describe?
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 enables automatic scaling of compute resources up or down in response to real-time demand. This startup's requirement to add or remove resources without manual intervention directly matches the definition of elasticity, which is a core benefit of cloud computing.
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 the system remains operational, but does not automatically scale resources.
✓
Elasticity
Why this is correct
Elasticity enables automatic scaling of resources to handle changing workload demands.
Related concept
Read the scenario before looking for a memorised answer.
✗
Fault tolerance
Why it's wrong here
Fault tolerance keeps the system running even if components fail, but does not involve automatic scaling.
✗
Disaster recovery
Why it's wrong here
Disaster recovery is about restoring services after a major disruption, not real-time scaling.
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 automatically recovering from failures (HA) is the same as automatically adjusting capacity to meet demand (elasticity).
Detailed technical explanation
How to think about this question
Under the hood, elasticity in Azure is implemented via Azure Virtual Machine Scale Sets and Azure App Service autoscale rules, which use metrics like CPU percentage or queue depth to trigger scale-out or scale-in operations. A subtle behavior is the 'cool-down' period (default 5 minutes) that prevents flapping—rapid scaling actions triggered by transient spikes—which can lead to unnecessary costs if not configured correctly. In a real-world scenario, an e-commerce site during a flash sale might scale from 10 to 500 VMs in minutes, then scale back down as traffic normalizes, demonstrating elasticity's cost-efficiency.
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 enables automatic scaling of compute resources up or down in response to real-time demand. This startup's requirement to add or remove resources without manual intervention directly matches the definition of elasticity, which is a core benefit of cloud computing.
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.
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.