- A
Elasticity
Why wrong: Elasticity implies that the system automatically scales resources in and out based on real-time demand. In this scenario, scaling is done manually by an administrator, so it does not meet the definition of elasticity.
- B
Scalability
Scalability is the ability to allocate more or fewer resources to a workload as needed. The manual resizing of the VM to handle traffic surges and the subsequent reduction is a clear example of vertical scalability.
- C
High availability
Why wrong: High availability refers to minimizing downtime by using redundant components and fault-tolerant designs. This scenario does not involve redundancy or failover; it focuses on handling increased load by adding resources.
- D
Disaster recovery
Why wrong: Disaster recovery involves a set of policies and procedures to recover from a major failure or data loss. The scenario describes routine scaling for traffic surges, not recovery from a disaster.
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 runs a web application on an Azure virtual machine. The application experiences periodic traffic surges during promotional campaigns. To handle the increased load, the IT team manually changes the VM size from Standard_D2s_v3 to Standard_D8s_v3 before each campaign and then changes it back after the campaign ends. Which cloud computing concept does this scenario exemplify?
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
Scalability
This scenario exemplifies scalability, specifically vertical scaling (scaling up), because the IT team manually increases the VM size to handle higher demand and then reduces it afterward. Scalability is the ability to adjust resources to meet changing workload demands, which is exactly what occurs when changing from Standard_D2s_v3 to Standard_D8s_v3.
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 it's wrong here
Elasticity implies that the system automatically scales resources in and out based on real-time demand. In this scenario, scaling is done manually by an administrator, so it does not meet the definition of elasticity.
- ✓
Scalability
Why this is correct
Scalability is the ability to allocate more or fewer resources to a workload as needed. The manual resizing of the VM to handle traffic surges and the subsequent reduction is a clear example of vertical scalability.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
High availability
Why it's wrong here
High availability refers to minimizing downtime by using redundant components and fault-tolerant designs. This scenario does not involve redundancy or failover; it focuses on handling increased load by adding resources.
- ✗
Disaster recovery
Why it's wrong here
Disaster recovery involves a set of policies and procedures to recover from a major failure or data loss. The scenario describes routine scaling for traffic surges, not recovery from a disaster.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse manual scaling with elasticity, but elasticity specifically requires automatic, on-demand resource adjustment without human intervention.
Trap categories for this question
Scenario analysis trap
Elasticity implies that the system automatically scales resources in and out based on real-time demand. In this scenario, scaling is done manually by an administrator, so it does not meet the definition of elasticity.
Detailed technical explanation
How to think about this question
Under the hood, changing a VM size triggers a reboot and reallocation of the VM to a different host node that has the required vCPU and memory capacity (e.g., 8 vCPUs and 32 GB RAM for Standard_D8s_v3). This is a classic example of vertical scaling, which is limited by the maximum size available in the VM series, whereas horizontal scaling (adding more VM instances) offers near-infinite elasticity. In real-world scenarios, Azure Autoscale can automate this process using VM scale sets, making the scaling elastic rather than manual.
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.
- →
Describe cloud concepts — study guide chapter
Learn the concepts, then practise the questions
- →
Describe cloud concepts practice questions
Targeted practice on this topic area only
- →
All AZ-900 questions
1,031 questions across all exam domains
- →
Microsoft Azure Fundamentals AZ-900 study guide
Full concept coverage aligned to exam objectives
- →
AZ-900 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related AZ-900 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Describe cloud concepts practice questions
Practise AZ-900 questions linked to Describe cloud concepts.
Describe Azure architecture and services practice questions
Practise AZ-900 questions linked to Describe Azure architecture and services.
Describe Azure management and governance practice questions
Practise AZ-900 questions linked to Describe Azure management and governance.
AZ-900 Azure services practice questions
Practise AZ-900 questions linked to AZ-900 Azure services.
AZ-900 pricing and support practice questions
Practise AZ-900 questions linked to AZ-900 pricing and support.
AZ-900 security and compliance practice questions
Practise AZ-900 questions linked to AZ-900 security and compliance.
AZ-900 governance practice questions
Practise AZ-900 questions linked to AZ-900 governance.
Practice this exam
Start a free AZ-900 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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: Scalability — This scenario exemplifies scalability, specifically vertical scaling (scaling up), because the IT team manually increases the VM size to handle higher demand and then reduces it afterward. Scalability is the ability to adjust resources to meet changing workload demands, which is exactly what occurs when changing from Standard_D2s_v3 to Standard_D8s_v3.
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 →
Last reviewed: Jun 11, 2026
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.