- A
Scalability
Why wrong: Scalability is the ability to handle increased load by adding resources, but it does not directly address maintaining operations during an Availability Zone failure.
- B
High availability
High availability ensures that the system remains operational even when components fail, such as an entire Availability Zone, by designing with redundancy and automatic failover.
- C
Elasticity
Why wrong: Elasticity is the ability to automatically scale resources up or down based on demand, not the ability to withstand zone failures.
- D
Disaster recovery
Why wrong: Disaster recovery involves processes and tools to restore operations after a major disaster, but it typically includes some downtime and manual steps, whereas the requirement is for continued operation without manual intervention.
Quick Answer
The answer is high availability. This is the correct concept because high availability focuses on ensuring an application remains operational and accessible despite infrastructure failures, such as the loss of an entire Availability Zone, by automatically failing over to redundant resources without manual intervention. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your ability to distinguish high availability from disaster recovery, which is a common trap: disaster recovery involves restoring services after a significant outage, often with data loss or downtime, whereas high availability aims for continuous uptime during a failure. A useful memory tip is to think of high availability as “always on” and disaster recovery as “backup and restore.”
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 a single Amazon EC2 instance in one Availability Zone. The company wants to ensure that if the entire Availability Zone becomes unavailable, the application continues to run without manual intervention. Which AWS cloud concept best describes this requirement?
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
High availability (B) is the correct concept because it ensures that an application remains operational even when an entire Availability Zone fails. By deploying the EC2 instance across multiple Availability Zones (e.g., using an Auto Scaling group with a minimum of two instances and an Application Load Balancer), the application can automatically fail over to a healthy instance in another zone without manual intervention. This directly addresses the requirement for continuous operation during a zone outage.
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.
- ✗
Scalability
Why it's wrong here
Scalability is the ability to handle increased load by adding resources, but it does not directly address maintaining operations during an Availability Zone failure.
- ✓
High availability
Why this is correct
High availability ensures that the system remains operational even when components fail, such as an entire Availability Zone, by designing with redundancy and automatic failover.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Elasticity
Why it's wrong here
Elasticity is the ability to automatically scale resources up or down based on demand, not the ability to withstand zone failures.
- ✗
Disaster recovery
Why it's wrong here
Disaster recovery involves processes and tools to restore operations after a major disaster, but it typically includes some downtime and manual steps, whereas the requirement is for continued operation without manual intervention.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse high availability with disaster recovery, but high availability focuses on automatic, immediate failover within a region (e.g., across Availability Zones), while disaster recovery involves restoring services after a major disruption, often with recovery time objectives (RTOs) measured in minutes or hours.
Detailed technical explanation
How to think about this question
Under the hood, high availability in AWS relies on distributing resources across multiple Availability Zones, which are physically separate data centers with independent power, cooling, and networking. Services like Amazon EC2 Auto Scaling with a multi-AZ launch configuration and an Elastic Load Balancer (ELB) perform health checks every few seconds; if an instance fails, the ELB stops routing traffic to it and Auto Scaling launches a replacement. This architecture achieves a Service Level Agreement (SLA) of 99.99% uptime for multi-AZ deployments, compared to 99.5% for a single instance.
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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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 — High availability (B) is the correct concept because it ensures that an application remains operational even when an entire Availability Zone fails. By deploying the EC2 instance across multiple Availability Zones (e.g., using an Auto Scaling group with a minimum of two instances and an Application Load Balancer), the application can automatically fail over to a healthy instance in another zone without manual intervention. This directly addresses the requirement for continuous operation during a zone outage.
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
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 →
Same concept, more angles
3 more ways 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 runs a customer-facing web application on a single Amazon EC2 instance. To improve resilience, the solutions architect decides to deploy a second EC2 instance in a different Availability Zone and configure an Application Load Balancer to distribute traffic. The goal is to ensure that the application remains accessible even if one instance or one Availability Zone becomes unavailable. Which cloud computing benefit does this architecture primarily aim to achieve?
medium- A.Elasticity
- ✓ B.High availability
- C.Scalability
- D.Cost optimization
Why B: By deploying a second EC2 instance in a different Availability Zone and using an Application Load Balancer (ALB) to distribute traffic, the architecture ensures that if one instance or one Availability Zone fails, the ALB automatically routes traffic to the healthy instance in the other AZ. This design directly achieves high availability by eliminating a single point of failure and maintaining application uptime during infrastructure failures.
Variation 2. A company runs a customer-facing web application on a single Amazon EC2 instance. To ensure the application remains accessible if the instance fails, the company launches a second EC2 instance in a different Availability Zone and configures an Application Load Balancer to distribute traffic. The application continues to serve users with minimal downtime during the failure of any single instance. This scenario best demonstrates which cloud computing concept?
medium- A.Elasticity
- ✓ B.High availability
- C.Scalability
- D.Fault tolerance
Why B: High availability is the correct concept because the architecture uses redundant EC2 instances in separate Availability Zones behind an Application Load Balancer to eliminate a single point of failure. If one instance fails, the load balancer automatically routes traffic to the healthy instance, ensuring the application remains accessible with minimal downtime. This design specifically addresses fault tolerance and uptime, not the ability to handle variable load or scale resources.
Variation 3. A company runs its production web application on a single Amazon EC2 instance located in one Availability Zone. Recently, a power outage in that data center caused the instance to become unavailable, resulting in application downtime. The company wants to redesign the architecture so that the application automatically continues serving users even if a single data center fails, without requiring manual intervention. Which cloud computing concept does this scenario BEST illustrate?
medium- A.Elasticity
- ✓ B.High availability
- C.On-demand self-service
- D.Broad network access
Why B: High availability (B) is the correct concept because the scenario describes designing an architecture that automatically continues serving users even if a single data center (Availability Zone) fails, without manual intervention. This is achieved by deploying the application across multiple Availability Zones, using an Elastic Load Balancer to distribute traffic, and configuring Auto Scaling groups to maintain instance health, ensuring the application remains accessible despite a zonal failure.
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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