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.
Which cloud computing characteristic allows an organization to avoid purchasing excess capacity to handle occasional peak loads?
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 computing characteristic that allows resources to automatically scale up to meet peak demand and scale down when demand decreases, so organizations only pay for what they use and avoid over-provisioning. This eliminates the need to purchase and maintain excess capacity for occasional load spikes, as the cloud provider dynamically allocates resources in real time.
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.
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High availability
Why it's wrong here
High availability ensures services stay up; elasticity specifically handles scaling to match demand.
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Geo-distribution
Why it's wrong here
Geo-distribution places services closer to users; it does not address over-provisioning for peaks.
✓
Elasticity
Why this is correct
Elasticity scales resources up/down dynamically, eliminating the need to purchase excess capacity for occasional peaks.
Related concept
Read the scenario before looking for a memorised answer.
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Durability
Why it's wrong here
Durability is about long-term data preservation, not resource scaling.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing elasticity with high availability, as both involve redundancy, but elasticity specifically addresses dynamic capacity adjustment for variable demand, not just uptime or fault tolerance.
Detailed technical explanation
How to think about this question
Elasticity is often implemented via auto-scaling groups (e.g., AWS Auto Scaling) that use metrics like CPU utilization or request count to trigger horizontal scaling—adding or removing virtual machine instances. Under the hood, this relies on cloud orchestration APIs and load balancers to distribute traffic, with scaling policies defined in JSON or YAML templates. A real-world scenario is an e-commerce site during Black Friday, where elasticity automatically spins up hundreds of instances to handle traffic spikes and then terminates them after the event, ensuring 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 computing characteristic that allows resources to automatically scale up to meet peak demand and scale down when demand decreases, so organizations only pay for what they use and avoid over-provisioning. This eliminates the need to purchase and maintain excess capacity for occasional load spikes, as the cloud provider dynamically allocates resources in real time.
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.
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Question Discussion
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