Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A retail company runs its e-commerce platform on AWS. The platform uses multiple Amazon EC2 instances behind an Application Load Balancer. To ensure the application remains available during an Availability Zone failure, the company distributes the instances across three Availability Zones. The load balancer automatically reroutes traffic away from an unhealthy zone. This design primarily addresses which pillar of the AWS Well-Architected Framework?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Security
The Security pillar focuses on protecting data, systems, and assets through identity and access management, detective controls, infrastructure protection, and data protection. Distributing instances across Availability Zones for fault tolerance does not primarily address security.
B
Distractor review
Performance Efficiency
The Performance Efficiency pillar focuses on using computing resources efficiently to meet system requirements and to maintain that efficiency as demand changes. While a load balancer helps with scaling, the core intent of multi-AZ deployment is fault tolerance, not performance optimization.
C
Distractor review
Cost Optimization
The Cost Optimization pillar focuses on avoiding unnecessary costs, selecting the right resource types, and managing spending. Although multi-AZ deployments may increase costs, the design described is primarily for availability, not cost reduction.
D
Best answer
Reliability
The Reliability pillar encompasses the ability of a workload to perform its intended function correctly and consistently when it is expected to. This includes building resilience to withstand failures, such as deploying across multiple Availability Zones and using automatic failover. This design directly supports the Reliability pillar.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A developer needs to launch a test server for a new application prototype. The developer logs into the AWS Management Console, selects an Amazon EC2 instance type, configures the security group, and starts the instance. The instance is running within two minutes, and the developer did not need to submit a formal request to the company's IT procurement team or wait for approval from a cloud administrator. Which essential characteristic of cloud computing does this scenario best demonstrate?
Question 2
A solutions architect is planning a new web application on AWS. The workload will include 3 Amazon EC2 instances (t3.medium) running 24/7, an Application Load Balancer, and an Amazon RDS for MySQL db.t3.small database. The architect needs to estimate the monthly cost for the first year, considering different purchasing options (On-Demand, 1-year All Upfront Reserved Instance, and Compute Savings Plan). Which AWS tool should the architect use to create this estimate?
Question 3
A company's development team frequently needs temporary test environments. A developer can log into the AWS Management Console, select an Amazon EC2 instance type, configure storage, and launch the instance within minutes without any interaction with the IT infrastructure team. This capability is an example of which essential characteristic of cloud computing?
Question 4
A company's finance team needs to analyze AWS spending in detail. They require a report that includes hourly cost data for each AWS service, each individual resource (e.g., a specific EC2 instance), and any cost allocation tags applied. The team plans to export this data to an Amazon S3 bucket and then import it into a custom business intelligence (BI) analytics dashboard. Which AWS tool should the finance team use to generate this level of detailed cost data?
Question 5
A company uses AWS for its development environment. The finance team wants to set a monthly budget of $10,000. They want to receive an email notification when the actual costs reach 80% of the budget ($8,000) and again when costs exceed the budget. The team needs a managed AWS service that can automatically send these alerts without requiring custom code or third-party tools. Which AWS service should the team use?
Question 6
A company uses AWS Organizations to manage multiple accounts. The security team needs to enforce a policy that restricts SSH access (port 22) from the internet (0.0.0.0/0) in all VPCs across all accounts. The team wants to centrally define the allowed rules and automatically apply them to newly created VPCs and security groups, while also automatically remediating any existing non-compliant security groups. Which AWS service should the team use?
FAQ
Questions learners often ask
What does this CLF-C02 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Reliability — The AWS Well-Architected Framework has six pillars: Operational Excellence, Security, Reliability, Performance Efficiency, Cost Optimization, and Sustainability. Deploying resources across multiple Availability Zones and using a load balancer with automatic failover directly supports the Reliability pillar, which includes the ability of a workload to recover from infrastructure or service disruptions and to dynamically acquire computing resources to meet demand. This design ensures the application continues to operate even if an entire Availability Zone fails, thereby improving resilience and availability.
What should I do if I get this CLF-C02 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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