CLF-C02 Cloud Concepts Practice Question
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?
⚠ Common exam trap
Many exam-takers confuse high availability with elasticity, mistakenly thinking that automatically adding more instances during a failure is the same as designing for fault tolerance across data centers, whereas elasticity handles scaling based on load, not zonal redundancy.
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 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.
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 capability to automatically scale resources up or down in response to changing workload demand, such as using Amazon EC2 Auto Scaling to add instances during spikes. However, elasticity does not address geographic or infrastructure redundancy; if the single Availability Zone hosting the application fails, all instances — regardless of their current scale — become unavailable. Therefore, elasticity helps manage load variability but cannot guarantee continued operation during a data center outage.
When this WOULD be correct
A company's web application experiences fluctuating traffic, and they want to automatically add or remove EC2 instances to match the current load without manual intervention. This would illustrate elasticity.
- ✓
High availability
Why this is correct
High availability refers to systems that are designed to be operational and accessible for a high percentage of time by eliminating single points of failure. Deploying across multiple Availability Zones is a common practice in AWS to achieve high availability.
- ✗
On-demand self-service
Why it's wrong here
On-demand self-service is a cloud characteristic that enables users to provision computing resources (e.g., launching an EC2 instance via the AWS Management Console) without requiring human interaction with the provider. While this allows for rapid recovery by manually spinning up a new environment after a failure, it does not proactively maintain availability because it depends on an operator triggering the action post-outage. The application would still experience downtime until a new resource is launched and configured, so this trait does not satisfy high-availability requirements.
When this WOULD be correct
A question describing a scenario where a company needs to quickly spin up additional EC2 instances during a traffic spike without contacting AWS support would illustrate on-demand self-service.
- ✗
Broad network access
Why it's wrong here
Broad network access means that cloud resources are reachable over the network via standard protocols (HTTPS, VPN, etc.) from a wide range of client devices. It addresses how users connect to the service, but it has no bearing on the resilience of the underlying infrastructure; if the single Availability Zone suffers an outage, the resource simply becomes unreachable regardless of its network accessibility. Thus, broad network access is unrelated to protecting against data center failures.
When this WOULD be correct
A company needs to ensure that its cloud resources can be accessed from various devices (e.g., laptops, smartphones, tablets) over the internet using standard protocols like HTTPS. Which cloud computing concept does this requirement BEST illustrate?
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.
✓High availabilityCorrect answer▾
Why this is correct
High availability refers to systems that are designed to be operational and accessible for a high percentage of time by eliminating single points of failure. Deploying across multiple Availability Zones is a common practice in AWS to achieve high availability.
✗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 service during a data center failure. The scenario describes a need for fault tolerance and automatic failover, which is high availability.
★ When this WOULD be the correct answer
A company's web application experiences fluctuating traffic, and they want to automatically add or remove EC2 instances to match the current load without manual intervention. This would illustrate elasticity.
Why candidates choose this
Candidates may confuse the automatic scaling aspect of elasticity with the automatic recovery aspect of high availability, or think that scaling across Availability Zones is about elasticity rather than availability.
✗On-demand self-serviceWrong answer — click to see why▾
Why this is wrong here
On-demand self-service refers to the ability to provision computing resources automatically without human interaction, not to ensuring application availability during a data center failure.
★ When this WOULD be the correct answer
A question describing a scenario where a company needs to quickly spin up additional EC2 instances during a traffic spike without contacting AWS support would illustrate on-demand self-service.
Why candidates choose this
Candidates may confuse the automatic provisioning aspect of on-demand self-service with the automatic failover required for high availability.
✗Broad network accessWrong answer — click to see why▾
Why this is wrong here
Broad network access refers to the ability to access cloud resources over the network using standard protocols, not to automatic recovery from data center failures. The scenario focuses on fault tolerance and automatic failover, which is high availability.
★ When this WOULD be the correct answer
A company needs to ensure that its cloud resources can be accessed from various devices (e.g., laptops, smartphones, tablets) over the internet using standard protocols like HTTPS. Which cloud computing concept does this requirement BEST illustrate?
Why candidates choose this
Candidates may confuse broad network access with the idea that the application remains accessible after a failure, but broad network access is about connectivity methods, not resilience.
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?”
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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.