- A
Elasticity
Why wrong: Elasticity is the ability to automatically scale resources up or down based on demand. While important, this scenario focuses on surviving an Availability Zone failure, not on scaling to handle changes in load.
- B
High availability
High availability is the correct characteristic. By deploying across multiple Availability Zones, the application can withstand the failure of an entire AZ and continue serving users, which is the essence of high availability.
- C
Scalability
Why wrong: Scalability is the capability to increase capacity to handle growing demand. The scenario does not describe adding or removing resources to match load, but rather maintaining operation during a failure.
- D
Fault tolerance
Why wrong: Fault tolerance implies the system continues operating correctly even when components fail, often with no noticeable impact. While related, the AWS Cloud Practitioner exam typically uses 'high availability' for Multi-AZ designs that may have minimal interruption during failover. Fault tolerance is a stricter requirement, and the term is less commonly used in this context.
CLF-C02 Cloud Concepts Practice Question
This CLF-C02 practice question tests your understanding of cloud concepts. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 runs a critical e-commerce application on Amazon EC2 instances distributed across multiple Availability Zones in a single AWS Region. The application is designed so that if an entire Availability Zone experiences an outage, the application continues to serve traffic from the remaining Availability Zones without interruption. Which benefit or characteristic of cloud computing does this scenario BEST represent?
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
High availability
The scenario describes an application that continues to serve traffic without interruption when an entire Availability Zone fails. This is the definition of high availability, which is achieved by distributing EC2 instances across multiple Availability Zones and using an Elastic Load Balancer to route traffic away from failed instances. High availability ensures fault tolerance and minimal downtime, which is a core benefit of cloud computing.
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.
- ✗
Elasticity
Why it's wrong here
Elasticity is the ability to automatically scale resources up or down based on demand. While important, this scenario focuses on surviving an Availability Zone failure, not on scaling to handle changes in load.
- ✓
High availability
Why this is correct
High availability is the correct characteristic. By deploying across multiple Availability Zones, the application can withstand the failure of an entire AZ and continue serving users, which is the essence of high availability.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Scalability
Why it's wrong here
Scalability is the capability to increase capacity to handle growing demand. The scenario does not describe adding or removing resources to match load, but rather maintaining operation during a failure.
- ✗
Fault tolerance
Why it's wrong here
Fault tolerance implies the system continues operating correctly even when components fail, often with no noticeable impact. While related, the AWS Cloud Practitioner exam typically uses 'high availability' for Multi-AZ designs that may have minimal interruption during failover. Fault tolerance is a stricter requirement, and the term is less commonly used in this context.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse high availability with elasticity or scalability, because both involve multiple instances, but high availability specifically addresses fault tolerance and uptime during failures, not dynamic scaling or load handling.
Trap categories for this question
Scenario analysis trap
Elasticity is the ability to automatically scale resources up or down based on demand. While important, this scenario focuses on surviving an Availability Zone failure, not on scaling to handle changes in load.
Detailed technical explanation
How to think about this question
High availability in AWS is typically implemented using an Auto Scaling group spanning multiple Availability Zones, combined with an Application Load Balancer that performs health checks and routes traffic only to healthy instances. Under the hood, the load balancer uses DNS-based routing and TCP/UDP health checks to detect failures, and the Auto Scaling group replaces failed instances automatically. In a real-world scenario, if one AZ loses power, the load balancer stops sending traffic to that AZ's instances within seconds, and the application continues serving from the remaining AZs.
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
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.
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: High availability — The scenario describes an application that continues to serve traffic without interruption when an entire Availability Zone fails. This is the definition of high availability, which is achieved by distributing EC2 instances across multiple Availability Zones and using an Elastic Load Balancer to route traffic away from failed instances. High availability ensures fault tolerance and minimal downtime, which is a core benefit of cloud computing.
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.
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?
Read the scenario before looking for a memorised answer.
About these practice questions
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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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