This MS-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.
Which cloud characteristic allows an organization to increase or decrease computing resources quickly based on demand, without requiring manual intervention?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Rapid elasticity
Rapid elasticity is the cloud characteristic that enables automatic, on-demand scaling of computing resources (such as virtual machines, storage, or network bandwidth) in response to fluctuating workload demands, without requiring manual provisioning or de-provisioning. This is a core feature of cloud computing defined by NIST SP 800-145, allowing resources to scale out (increase) or scale in (decrease) dynamically, often using orchestration tools like Azure Autoscale or AWS Auto Scaling. The key distinction is that the scaling happens quickly and automatically, based on predefined rules or metrics like CPU utilization or request count.
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.
✗
Measured service
Why it's wrong here
Measured service refers to metering resource usage for billing and optimization, not automatic scaling.
✓
Rapid elasticity
Why this is correct
Rapid elasticity allows resources to be provisioned and released quickly, often automatically, to scale with demand.
Related concept
Read the scenario before looking for a memorised answer.
✗
Resource pooling
Why it's wrong here
Resource pooling means the provider serves multiple customers from shared resources, not automatic scaling.
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Broad network access
Why it's wrong here
Broad network access means resources are accessible over the network from various devices, not automatic scaling.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'rapid elasticity' with 'resource pooling' because both involve dynamic allocation, but resource pooling is about sharing resources among multiple tenants, not about automatically scaling a single tenant's resources on demand.
Detailed technical explanation
How to think about this question
Under the hood, rapid elasticity is often implemented using infrastructure-as-code (IaC) tools like Azure Resource Manager (ARM) templates or Terraform, combined with autoscaling services that monitor performance metrics (e.g., Azure Monitor metrics) and trigger scale-out or scale-in actions via REST APIs. A subtle behavior is that elasticity can be horizontal (adding/removing instances) or vertical (resizing existing instances), but horizontal scaling is more common in cloud-native architectures due to its ability to handle sudden spikes without downtime. In a real-world scenario, an e-commerce site using Azure Virtual Machine Scale Sets can automatically add hundreds of VM instances during a flash sale and remove them afterward, ensuring cost efficiency and performance without manual intervention.
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 MS-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: Rapid elasticity — Rapid elasticity is the cloud characteristic that enables automatic, on-demand scaling of computing resources (such as virtual machines, storage, or network bandwidth) in response to fluctuating workload demands, without requiring manual provisioning or de-provisioning. This is a core feature of cloud computing defined by NIST SP 800-145, allowing resources to scale out (increase) or scale in (decrease) dynamically, often using orchestration tools like Azure Autoscale or AWS Auto Scaling. The key distinction is that the scaling happens quickly and automatically, based on predefined rules or metrics like CPU utilization or request count.
What should I do if I get this MS-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.
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Question Discussion
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