- A
Elasticity
Why wrong: Elasticity is the ability to automatically scale computing resources up or down based on demand. This concept is about matching capacity to workload, not about surviving an Availability Zone failure.
- B
Fault tolerance
Correct. Fault tolerance describes a system that continues operating without interruption despite the failure of one or more components. Distributing workloads across multiple Availability Zones is a key method to achieve fault tolerance in AWS.
- C
Scalability
Why wrong: Scalability is the ability to handle increasing loads by adding resources. While related to growth, it does not inherently ensure continuous operation when a whole data center fails.
- D
Resource pooling
Why wrong: Resource pooling is a characteristic of cloud computing where the provider's computing resources are pooled to serve multiple customers (multi-tenancy). It does not directly address failure recovery across data centers.
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 startup is deploying a web application on Amazon EC2 instances across multiple Availability Zones (AZs). The architecture must ensure that the application remains fully operational and available to users even if one entire AZ fails. Which cloud computing concept does this requirement MOST directly represent?
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
Fault tolerance
Fault tolerance is the correct concept because the requirement specifies that the application must remain fully operational and available even if an entire Availability Zone fails. By deploying EC2 instances across multiple AZs and using an Elastic Load Balancer to distribute traffic, the architecture can withstand the failure of one AZ without any interruption in service, which is the essence of fault tolerance.
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 computing resources up or down based on demand. This concept is about matching capacity to workload, not about surviving an Availability Zone failure.
When this WOULD be correct
A question that asks: 'A web application experiences variable traffic spikes. Which cloud computing concept allows the system to automatically add or remove EC2 instances to match the current load?' would make elasticity the correct answer.
- ✓
Fault tolerance
Why this is correct
Correct. Fault tolerance describes a system that continues operating without interruption despite the failure of one or more components. Distributing workloads across multiple Availability Zones is a key method to achieve fault tolerance in AWS.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Scalability
Why it's wrong here
Scalability is the ability to handle increasing loads by adding resources. While related to growth, it does not inherently ensure continuous operation when a whole data center fails.
When this WOULD be correct
A question asking: 'A company expects a sudden spike in traffic for a new product launch. Which cloud concept ensures the application can automatically add EC2 instances to handle the increased load?' would make scalability correct.
- ✗
Resource pooling
Why it's wrong here
Resource pooling is a characteristic of cloud computing where the provider's computing resources are pooled to serve multiple customers (multi-tenancy). It does not directly address failure recovery across data centers.
When this WOULD be correct
A question asking which cloud characteristic allows multiple customers to use the same physical infrastructure securely and independently would make resource pooling the correct answer.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓Fault toleranceCorrect answer▾
Why this is correct
Correct. Fault tolerance describes a system that continues operating without interruption despite the failure of one or more components. Distributing workloads across multiple Availability Zones is a key method to achieve fault tolerance in AWS.
✗ElasticityWrong answer — click to see why▾
Why this is wrong here
Elasticity refers to the ability to automatically scale resources up or down based on demand, not to maintain operation during an AZ failure. The question specifically asks about surviving an AZ failure, which is fault tolerance.
★ When this WOULD be the correct answer
A question that asks: 'A web application experiences variable traffic spikes. Which cloud computing concept allows the system to automatically add or remove EC2 instances to match the current load?' would make elasticity the correct answer.
Why candidates choose this
Candidates may confuse elasticity with high availability or fault tolerance because both involve handling changes in the environment, but elasticity is about scaling, not surviving failures.
✗ScalabilityWrong answer — click to see why▾
Why this is wrong here
Scalability refers to the ability to increase or decrease resources to handle varying load, not to maintain operation during an AZ failure. The requirement is about surviving a failure, not adjusting to demand.
★ When this WOULD be the correct answer
A question asking: 'A company expects a sudden spike in traffic for a new product launch. Which cloud concept ensures the application can automatically add EC2 instances to handle the increased load?' would make scalability correct.
Why candidates choose this
Candidates may confuse fault tolerance with scalability because both involve multiple instances, but scalability focuses on performance under load, not failure resilience.
✗Resource poolingWrong answer — click to see why▾
Why this is wrong here
Resource pooling refers to the provider's ability to serve multiple customers from shared physical resources, not to application availability across AZ failures.
★ When this WOULD be the correct answer
A question asking which cloud characteristic allows multiple customers to use the same physical infrastructure securely and independently would make resource pooling the correct answer.
Why candidates choose this
Candidates may confuse resource pooling with high availability or fault tolerance because both involve distributing workloads across multiple resources.
Analysis generated from the official CLF-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse fault tolerance with high availability, but fault tolerance specifically implies zero downtime and no data loss during a failure, whereas high availability may allow for brief interruptions or degraded performance.
Detailed technical explanation
How to think about this question
Fault tolerance in AWS is achieved through redundancy and automated failover mechanisms. For example, deploying EC2 instances in at least two AZs behind an Application Load Balancer (ALB) with health checks ensures that traffic is only routed to healthy instances. If an entire AZ fails, the ALB automatically stops sending requests to that AZ's instances, and the application continues to serve users from the remaining AZs. This design relies on the AWS global infrastructure's isolated AZs, which are connected via low-latency links but are independent in terms of power, cooling, and physical location.
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.
- →
Cloud Concepts — study guide chapter
Learn the concepts, then practise the questions
- →
Cloud Concepts practice questions
Targeted practice on this topic area only
- →
All CLF-C02 questions
1,024 questions across all exam domains
- →
AWS Certified Cloud Practitioner CLF-C02 study guide
Full concept coverage aligned to exam objectives
- →
CLF-C02 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related CLF-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Cloud Concepts practice questions
Practise CLF-C02 questions linked to Cloud Concepts.
Security and Compliance practice questions
Practise CLF-C02 questions linked to Security and Compliance.
Cloud Technology and Services practice questions
Practise CLF-C02 questions linked to Cloud Technology and Services.
Billing, Pricing, and Support practice questions
Practise CLF-C02 questions linked to Billing, Pricing, and Support.
AWS shared responsibility model practice questions
Practise CLF-C02 questions linked to AWS shared responsibility model.
AWS IAM practice questions
Practise CLF-C02 questions linked to AWS IAM.
AWS pricing practice questions
Practise CLF-C02 questions linked to AWS pricing.
AWS support plans practice questions
Practise CLF-C02 questions linked to AWS support plans.
AWS S3 practice questions
Practise CLF-C02 questions linked to AWS S3.
AWS EC2 practice questions
Practise CLF-C02 questions linked to AWS EC2.
Practice this exam
Start a free CLF-C02 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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: Fault tolerance — Fault tolerance is the correct concept because the requirement specifies that the application must remain fully operational and available even if an entire Availability Zone fails. By deploying EC2 instances across multiple AZs and using an Elastic Load Balancer to distribute traffic, the architecture can withstand the failure of one AZ without any interruption in service, which is the essence of fault tolerance.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More CLF-C02 practice questions
- A company publishes a message each time a new product is added to its catalogue. Three services need to receive this mes…
- A media company stores frequently accessed video thumbnails in Amazon S3. The thumbnails are read multiple times every d…
- A company needs a service to translate domain names (like www.example.com) into IP addresses, check the health of their…
- A startup runs an application on AWS and receives a monthly bill that charges exactly for the number of compute hours us…
- A financial institution runs its core banking application on-premises due to regulatory requirements. It has connected i…
- A company wants to run a MySQL database in AWS without managing database software installation, applying patches, settin…
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.