CLF-C02 Cloud Concepts Practice Question
A company is evaluating the AWS Sustainability pillar in the Well-Architected Framework. Which action aligns with AWS cloud sustainability best practices?
⚠ Common exam trap
Test-takers frequently confuse the Sustainability pillar with the Reliability pillar, assuming that maximizing redundancy or always-on resources is always beneficial, but the exam specifically tests that sustainability prioritizes minimizing resource consumption and waste.
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
✓
Right-sizing instances and using managed services to maximize resource utilization
Right-sizing instances and using managed services directly aligns with the AWS Sustainability pillar, which focuses on minimizing the environmental impact of cloud workloads. By matching instance capacity to actual demand and leveraging services like AWS Lambda or Amazon RDS, you reduce wasted compute cycles and energy consumption, improving resource utilization and lowering carbon footprint.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Provisioning maximum instance sizes to ensure peak performance at all times
Why it's wrong here
Provisioning maximum instance sizes to ensure peak performance at all times is wasteful because most workloads rarely reach peak, leaving expensive CPU and memory idle and still consuming electricity. Oversized EC2 instances incur a higher carbon footprint per unit of useful work, and AWS Sustainability specifically recommends using Compute Optimizer and auto scaling to select the smallest instance class that meets actual demand. Peak performance can be achieved with elastic scaling rather than permanent over-provisioning, avoiding energy spent on unused capacity.
- ✗
Running workloads 24/7 even when not needed to maintain warm state
Why it's wrong here
Running workloads 24/7 to maintain a warm state keeps compute resources active even during long periods of no traffic, which constantly draws power in the data center. For non-production or low-traffic environments, you can stop EC2 instances or use scheduled scaling to reduce idle energy consumption, or adopt serverless services that scale to zero. This directly supports the Sustainability pillar by eliminating the environmental cost of resources that do not process user requests, while still allowing a cold start to restore availability.
- ✓
Right-sizing instances and using managed services to maximize resource utilization
Why this is correct
Right-sizing instances and using managed services to maximize resource utilization is the correct sustainability approach because it minimizes wasted capacity and energy while maintaining performance. Right-sizing matches the instance type and size to the measured workload profile, avoiding over-provisioned idle resources, while managed services like Lambda and Fargate run on shared infrastructure that AWS optimizes for high utilization across many customers, reducing per-workload carbon emissions. This also includes automatic scaling, so you consume only the compute actually needed, which is a core pillar of the AWS Well-Architected Sustainability design.
- ✗
Replicating all data to multiple regions for maximum redundancy
Why it's wrong here
Replicating all data to multiple regions for maximum redundancy multiplies the amount of storage, network transfer, and synchronization activity, all of which increase energy consumption and operational overhead. Sustainability requires balancing redundancy against actual recovery requirements: you can achieve high availability within a single region using Multi-AZ, and only add remote regions for specific DR needs like RPO/RTO. Over-replication also creates data transfer and compliance risks, so it is not a sustainability best practice, though it may seem beneficial for resilience.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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About these practice questions
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Same concept, more angles
1 more way this is tested on CLF-C02
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company wants to understand the AWS Well-Architected Framework's sixth pillar added in 2021. Which pillar focuses on minimizing the environmental impact of cloud workloads?
medium- A.Cost Optimization
- ✓ B.Sustainability
- C.Governance
- D.Resilience
Why B: The AWS Well-Architected Framework added a sixth pillar, Sustainability, in 2021. This pillar provides design principles and best practices to minimize the environmental impact of cloud workloads, such as optimizing utilization, reducing energy consumption, and selecting efficient hardware and regions.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.