- A
Cost Optimisation
Why wrong: Cost Optimisation focuses on financial efficiency. While reducing resource waste can lower both cost and environmental impact, the pillar specifically concerned with environmental impact is Sustainability.
- B
Performance Efficiency
Why wrong: Performance Efficiency focuses on using the right resources for the job. Environmental impact through reduced energy consumption is the Sustainability pillar's domain.
- C
Sustainability
The Sustainability pillar focuses on minimising the environmental impact of running cloud workloads. This includes maximising instance utilisation, using energy-efficient hardware (like Graviton), and eliminating unnecessary compute.
- D
Reliability
Why wrong: Reliability focuses on a system's ability to recover from failure. Environmental impact minimisation is the Sustainability pillar.
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. 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 wants to minimise the environmental impact of their AWS workloads by choosing the right instance sizes, maximising utilisation, using graviton processors for better performance per watt, and designing architectures that reduce total compute needed. Which AWS Well-Architected Framework pillar guides these decisions?
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
Sustainability
The Sustainability pillar of the AWS Well-Architected Framework focuses on minimizing the environmental impact of cloud workloads. Choosing right-sized instances, maximizing utilization, using Graviton processors for better performance per watt, and designing architectures to reduce total compute directly align with sustainability goals by reducing energy consumption and carbon footprint.
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.
- ✗
Cost Optimisation
Why it's wrong here
Cost Optimisation focuses on financial efficiency. While reducing resource waste can lower both cost and environmental impact, the pillar specifically concerned with environmental impact is Sustainability.
- ✗
Performance Efficiency
Why it's wrong here
Performance Efficiency focuses on using the right resources for the job. Environmental impact through reduced energy consumption is the Sustainability pillar's domain.
- ✓
Sustainability
Why this is correct
The Sustainability pillar focuses on minimising the environmental impact of running cloud workloads. This includes maximising instance utilisation, using energy-efficient hardware (like Graviton), and eliminating unnecessary compute.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Reliability
Why it's wrong here
Reliability focuses on a system's ability to recover from failure. Environmental impact minimisation is the Sustainability pillar.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse the Sustainability pillar with Cost Optimization because both involve reducing waste, but Sustainability specifically targets environmental impact and energy efficiency, not just financial savings.
Detailed technical explanation
How to think about this question
AWS Graviton processors are based on ARM architecture and deliver up to 40% better performance per watt compared to x86-based instances, directly reducing energy consumption. Right-sizing involves analyzing CloudWatch metrics like CPU utilization and memory usage to match instance capacity to workload demand, avoiding over-provisioning that wastes energy. Designing architectures to reduce total compute, such as using serverless services like AWS Lambda, further minimizes idle resources and associated environmental impact.
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.
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.
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Cloud Concepts — study guide chapter
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Cloud Concepts — This question tests Cloud Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Sustainability — The Sustainability pillar of the AWS Well-Architected Framework focuses on minimizing the environmental impact of cloud workloads. Choosing right-sized instances, maximizing utilization, using Graviton processors for better performance per watt, and designing architectures to reduce total compute directly align with sustainability goals by reducing energy consumption and carbon footprint.
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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Last reviewed: Jun 11, 2026
This CLF-C02 practice question is part of Courseiva's free Amazon Web Services 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 CLF-C02 exam.
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