- A
Elasticity
Why wrong: Elasticity refers to the ability to automatically scale resources up or down based on demand. The scenario is about fault tolerance and continuous operation during a failure, not about scaling to meet variable load.
- B
High availability
Correct. Deploying resources across multiple Availability Zones to withstand the failure of an entire data center is the definition of high availability in cloud computing. It ensures that the application remains accessible despite infrastructure failures.
- C
Scalability
Why wrong: Scalability is the ability to handle increased workload by adding resources (e.g., more instances or larger instances). The scenario focuses on redundancy and uptime, not on handling growth.
- D
Security
Why wrong: Security involves protecting data, systems, and networks from threats. While high availability contributes to resilience, it is not a security control. The scenario does not describe authentication, encryption, or access control.
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 database on a single Amazon EC2 instance in a single Availability Zone. To increase fault tolerance and minimize downtime, the architecture team decides to deploy the database across multiple Availability Zones using a primary/standby configuration. This design pattern of distributing resources across isolated locations to ensure continuous operation even if an entire data center fails best demonstrates which fundamental concept of cloud computing?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"primary"Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Deploying a critical database across multiple Availability Zones in a primary/standby configuration ensures that if one data center (AZ) fails, the standby instance can take over with minimal downtime. This design directly implements high availability (HA), which is the ability of a system to remain operational despite component failures. The scenario specifically describes fault tolerance through geographic redundancy, which is the core of HA in 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 refers to the ability to automatically scale resources up or down based on demand. The scenario is about fault tolerance and continuous operation during a failure, not about scaling to meet variable load.
When this WOULD be correct
A question describing a workload that automatically adds or removes EC2 instances in response to traffic spikes, such as an e-commerce site during a flash sale, would make elasticity the correct answer.
- ✓
High availability
Why this is correct
Correct. Deploying resources across multiple Availability Zones to withstand the failure of an entire data center is the definition of high availability in cloud computing. It ensures that the application remains accessible despite infrastructure failures.
Clue confirmation
The clue words "primary", "minimum / minimize" 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 ability to handle increased workload by adding resources (e.g., more instances or larger instances). The scenario focuses on redundancy and uptime, not on handling growth.
When this WOULD be correct
A question that asks: 'A company's e-commerce application experiences sudden spikes in traffic during flash sales. The architecture team wants to automatically add EC2 instances during peak times and remove them when demand drops. Which cloud computing concept does this best demonstrate?' Here, scalability would be correct because it focuses on adjusting capacity to meet demand.
- ✗
Security
Why it's wrong here
Security involves protecting data, systems, and networks from threats. While high availability contributes to resilience, it is not a security control. The scenario does not describe authentication, encryption, or access control.
When this WOULD be correct
A question asking which cloud computing concept is demonstrated by encrypting data at rest and in transit, implementing IAM policies, and configuring network ACLs to protect a multi-tier application.
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
Correct. Deploying resources across multiple Availability Zones to withstand the failure of an entire data center is the definition of high availability in cloud computing. It ensures that the application remains accessible despite infrastructure failures.
✗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 distributing resources across isolated locations for fault tolerance.
★ When this WOULD be the correct answer
A question describing a workload that automatically adds or removes EC2 instances in response to traffic spikes, such as an e-commerce site during a flash sale, would make elasticity the correct answer.
Why candidates choose this
Candidates may confuse the concept of adding more resources (scaling) with distributing resources for redundancy, or they might think that deploying across multiple AZs involves 'elastic' resource allocation.
✗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 distributing resources across isolated locations for fault tolerance. The question describes a primary/standby configuration across Availability Zones to ensure continuous operation during a data center failure, which is a high availability pattern, not scalability.
★ When this WOULD be the correct answer
A question that asks: 'A company's e-commerce application experiences sudden spikes in traffic during flash sales. The architecture team wants to automatically add EC2 instances during peak times and remove them when demand drops. Which cloud computing concept does this best demonstrate?' Here, scalability would be correct because it focuses on adjusting capacity to meet demand.
Why candidates choose this
Candidates may confuse scalability with high availability because both involve multiple resources, but scalability is about handling load changes, not ensuring uptime during failures. The term 'distributing resources' can mistakenly be associated with scaling out.
✗SecurityWrong answer — click to see why▾
Why this is wrong here
The question describes distributing resources across multiple Availability Zones to ensure continuous operation, which is a high availability pattern. Security is about protecting data and systems from threats, not about fault tolerance or minimizing downtime from infrastructure failures.
★ When this WOULD be the correct answer
A question asking which cloud computing concept is demonstrated by encrypting data at rest and in transit, implementing IAM policies, and configuring network ACLs to protect a multi-tier application.
Why candidates choose this
Candidates may confuse high availability with security because both involve redundancy and protection, but security focuses on access control and data protection rather than uptime and fault tolerance.
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
AWS often tests the distinction between high availability (fault tolerance across AZs) and scalability (handling increased load), so the trap here is confusing the ability to survive failures with the ability to grow capacity.
Trap categories for this question
Scenario analysis trap
Elasticity refers to the ability to automatically scale resources up or down based on demand. The scenario is about fault tolerance and continuous operation during a failure, not about scaling to meet variable load.
Detailed technical explanation
How to think about this question
In AWS, a primary/standby database configuration across AZs typically uses synchronous replication (e.g., Amazon RDS Multi-AZ with synchronous block-level replication to a standby in a different AZ). The failover is automatic and typically completes within 60-120 seconds, leveraging DNS record updates and the AWS Multi-AZ feature. Under the hood, this relies on the AWS global infrastructure's isolated AZs, each with independent power, cooling, and physical security, connected via low-latency links.
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 — Deploying a critical database across multiple Availability Zones in a primary/standby configuration ensures that if one data center (AZ) fails, the standby instance can take over with minimal downtime. This design directly implements high availability (HA), which is the ability of a system to remain operational despite component failures. The scenario specifically describes fault tolerance through geographic redundancy, which is the core of HA in 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: "primary", "minimum / minimize". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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 →
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Last reviewed: Jun 30, 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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