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.
What is 'scalability' in the context of cloud computing?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The ability to increase or decrease resources to match demand
Scalability in cloud computing refers to the ability to dynamically adjust resources (such as compute power, memory, or storage) to match fluctuating demand. This is a core benefit of cloud platforms like Azure, enabling automatic scaling via services such as Azure Virtual Machine Scale Sets or Azure App Service autoscale, ensuring performance without over-provisioning.
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.
✗
The ability to keep services running during failures
Why it's wrong here
Keeping services running during failures describes high availability or fault tolerance.
✓
The ability to increase or decrease resources to match demand
Why this is correct
Scalability is the ability to add or remove resources dynamically to match workload demand.
Related concept
Read the scenario before looking for a memorised answer.
✗
The ability to recover data after a disaster
Why it's wrong here
Data recovery after disaster describes disaster recovery, not scalability.
✗
The ability to deploy resources in multiple geographic regions
Why it's wrong here
Geographic deployment describes global reach or geo-redundancy, not scalability.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing scalability with high availability or disaster recovery, as all three are cloud benefits but serve distinct purposes; candidates often pick 'keeping services running during failures' (A) because they associate 'scaling' with reliability, but scalability is specifically about matching demand, not fault tolerance.
Detailed technical explanation
How to think about this question
Scalability can be vertical (scaling up/down by increasing or decreasing the size of a single resource, e.g., changing a VM from Standard_D2s_v3 to Standard_D4s_v3) or horizontal (scaling out/in by adding or removing instances, e.g., using Azure Load Balancer with a scale set). Azure Monitor and autoscale rules use metrics like CPU percentage or queue depth to trigger scaling actions, with a cooldown period (default 5 minutes) to prevent thrashing. In a real-world scenario, an e-commerce site might scale out during Black Friday traffic spikes and scale in afterward to reduce 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
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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: The ability to increase or decrease resources to match demand — Scalability in cloud computing refers to the ability to dynamically adjust resources (such as compute power, memory, or storage) to match fluctuating demand. This is a core benefit of cloud platforms like Azure, enabling automatic scaling via services such as Azure Virtual Machine Scale Sets or Azure App Service autoscale, ensuring performance without over-provisioning.
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.