- A
High availability
Why wrong: High availability refers to the ability of a system to remain operational and accessible for a high percentage of time, typically through redundancy and failover mechanisms. While important for uptime, it does not specifically describe the automatic scaling of resources based on demand.
- B
Elasticity
Elasticity is the ability to provision and de-provision computing resources automatically to match workload demands. This concept allows the company to handle traffic spikes without manual intervention and only pay for resources consumed, directly matching the scenario.
- C
Fault tolerance
Why wrong: Fault tolerance is the ability of a system to continue operating without interruption when one or more of its components fail. It often involves redundancy and automatic failover, but it does not address scaling resources up and down in response to workload changes.
- D
Pay-as-you-go
Why wrong: Pay-as-you-go is a pricing model where customers pay only for the resources they consume, with no upfront commitments. While the scenario mentions paying only for what is used, the primary focus is on the automatic scaling of capacity, which is a characteristic of elasticity, not of the pricing model alone.
CLF-C02 Cloud Concepts Practice Question
This CLF-C02 practice question tests your understanding of 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. A key principle to apply: elasticity is the ability to automatically scale resources up or down.. 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 AWS that experiences unpredictable traffic spikes. The operations team wants the infrastructure to automatically add compute capacity when demand increases and remove it when demand decreases, without manual intervention. The team also wants to pay only for the compute resources they actually use. Which cloud computing concept does this scenario best describe?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Elasticity
Elasticity is the ability of a cloud system to automatically scale resources up or down based on demand. In this scenario, AWS services like Auto Scaling groups and Amazon EC2 can add instances during traffic spikes and terminate them when demand drops, ensuring the infrastructure matches workload requirements without manual intervention.
Key principle: Elasticity is the ability to automatically scale resources up or down.
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 refers to the ability of a system to remain operational and accessible for a high percentage of time, typically through redundancy and failover mechanisms. While important for uptime, it does not specifically describe the automatic scaling of resources based on demand.
- ✓
Elasticity
Why this is correct
Elasticity is the ability to provision and de-provision computing resources automatically to match workload demands. This concept allows the company to handle traffic spikes without manual intervention and only pay for resources consumed, directly matching the scenario.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Elasticity is the ability to automatically scale resources up or down.
- ✗
Fault tolerance
Why it's wrong here
Fault tolerance is the ability of a system to continue operating without interruption when one or more of its components fail. It often involves redundancy and automatic failover, but it does not address scaling resources up and down in response to workload changes.
- ✗
Pay-as-you-go
Why it's wrong here
Pay-as-you-go is a pricing model where customers pay only for the resources they consume, with no upfront commitments. While the scenario mentions paying only for what is used, the primary focus is on the automatic scaling of capacity, which is a characteristic of elasticity, not of the pricing model alone.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'pay-as-you-go' (a billing model) with 'elasticity' (the operational capability to scale), but the question explicitly asks for the concept that enables automatic scaling, not just the cost benefit.
Trap categories for this question
Scenario analysis trap
Pay-as-you-go is a pricing model where customers pay only for the resources they consume, with no upfront commitments. While the scenario mentions paying only for what is used, the primary focus is on the automatic scaling of capacity, which is a characteristic of elasticity, not of the pricing model alone.
Detailed technical explanation
How to think about this question
Under the hood, AWS Auto Scaling uses CloudWatch alarms to monitor metrics like CPU utilization or request count, triggering scaling policies that adjust the desired capacity of an Auto Scaling group. This involves launching new EC2 instances from an AMI or terminating idle ones, and can be combined with Elastic Load Balancing to distribute traffic. A real-world scenario is an e-commerce site during Black Friday, where elasticity ensures thousands of instances spin up to handle traffic and then terminate to save costs.
KKey Concepts to Remember
- Elasticity is the ability to automatically scale resources up or down.
- It matches compute capacity to actual workload demand.
- AWS services like EC2 Auto Scaling provide elasticity.
- Elasticity helps optimize costs by paying only for what is used.
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
Elasticity is the ability to automatically scale resources up or down.
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.
Review elasticity is the ability to automatically scale resources up or down., then practise related CLF-C02 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Cloud Concepts — This question tests Cloud Concepts — Elasticity is the ability to automatically scale resources up or down..
What is the correct answer to this question?
The correct answer is: Elasticity — Elasticity is the ability of a cloud system to automatically scale resources up or down based on demand. In this scenario, AWS services like Auto Scaling groups and Amazon EC2 can add instances during traffic spikes and terminate them when demand drops, ensuring the infrastructure matches workload requirements without manual intervention.
What should I do if I get this CLF-C02 question wrong?
Review elasticity is the ability to automatically scale resources up or down., then practise related CLF-C02 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Elasticity is the ability to automatically scale resources up or down.
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Last reviewed: Jun 11, 2026
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