The answer is Spot Instances, the correct choice because this AWS EC2 pricing model lets you bid for unused EC2 capacity, offering potential savings of up to 90% compared to On-Demand pricing in exchange for accepting that instances may be interrupted. The technical trade-off is that AWS can reclaim this capacity—by terminating or hibernating your instance—when the Spot price exceeds your bid or when the capacity is needed for On-Demand or Reserved Instance customers, making it ideal only for fault-tolerant and flexible workloads. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your understanding of the core trade-off between cost savings and reliability; a common trap is confusing Spot Instances with Reserved Instances, which offer steady discounts without interruption risk. Remember the memory tip: “Spot is a bargain, but you might get the boot”—if your workload can handle interruptions, Spot saves you up to 90%.
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and services. 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 Amazon EC2 pricing option allows customers to bid for unused EC2 capacity with potential savings of up to 90%, while accepting that instances may be interrupted?
Why wrong: On-Demand provides capacity on request at full price with no interruption risk.
B
Reserved Instances
Why wrong: Reserved Instances provide discounts for 1 or 3-year commitments — they're not spare capacity and cannot be interrupted by AWS.
C
Spot Instances
Spot Instances use AWS spare capacity at up to 90% discount, with the trade-off that AWS can interrupt with 2 minutes notice when capacity is needed.
D
Dedicated Instances
Why wrong: Dedicated Instances run on hardware dedicated to a single customer — they're about physical isolation, not discounted pricing on spare capacity.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Spot Instances
Spot Instances allow customers to bid for unused EC2 capacity, offering potential savings of up to 90% compared to On-Demand pricing. However, these instances can be interrupted (terminated or hibernated) by AWS when the Spot price exceeds the customer's bid or when capacity is needed for On-Demand or Reserved Instance customers, making them ideal for fault-tolerant and flexible workloads.
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.
✗
On-Demand Instances
Why it's wrong here
On-Demand provides capacity on request at full price with no interruption risk.
✗
Reserved Instances
Why it's wrong here
Reserved Instances provide discounts for 1 or 3-year commitments — they're not spare capacity and cannot be interrupted by AWS.
✓
Spot Instances
Why this is correct
Spot Instances use AWS spare capacity at up to 90% discount, with the trade-off that AWS can interrupt with 2 minutes notice when capacity is needed.
Related concept
Read the scenario before looking for a memorised answer.
✗
Dedicated Instances
Why it's wrong here
Dedicated Instances run on hardware dedicated to a single customer — they're about physical isolation, not discounted pricing on spare capacity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse Spot Instances with Reserved Instances, thinking both offer similar discounts, but Reserved Instances require a commitment and are not interruptible, while Spot Instances are interruptible and involve bidding on unused capacity.
Detailed technical explanation
How to think about this question
Spot Instances leverage AWS's spare compute capacity, with pricing dynamically adjusted based on supply and demand; the Spot price fluctuates and can be monitored via the Amazon EC2 Spot Instance pricing history. When the Spot price exceeds your maximum bid, AWS sends a two-minute interruption notice before stopping or terminating the instance, allowing applications to checkpoint or gracefully shut down. A real-world scenario is running batch processing jobs or rendering workloads that can be resumed, where using Spot Instances can drastically reduce costs compared to On-Demand.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CLF-C02 question in full detail.
Cloud Technology and Services — This question tests Cloud Technology and Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Spot Instances — Spot Instances allow customers to bid for unused EC2 capacity, offering potential savings of up to 90% compared to On-Demand pricing. However, these instances can be interrupted (terminated or hibernated) by AWS when the Spot price exceeds the customer's bid or when capacity is needed for On-Demand or Reserved Instance customers, making them ideal for fault-tolerant and flexible workloads.
What should I do if I get this CLF-C02 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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