← CLF-C02·Amazon Web Services

Question 872 of 1,024

Cloud Concepts →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is high availability. Deploying a critical database across multiple Availability Zones in a primary/standby configuration ensures that if an entire data center fails, the standby instance can take over with minimal downtime, which is the core definition of high availability. This design pattern directly implements fault tolerance through geographic redundancy, but the scenario specifically demonstrates high availability because it focuses on keeping the system operational despite failures, not on eliminating all single points of failure. On the AWS Certified Cloud Practitioner CLF-C02 exam, this concept tests your understanding of how distributing resources across isolated locations—the key difference between high availability vs fault tolerance in AWS—ensures business continuity. A common trap is confusing high availability with fault tolerance; remember that high availability aims for minimal downtime (often using a standby), while fault tolerance aims for zero downtime (often using active-active load balancing). Memory tip: think “HA = Hot Standby” for quick recall.

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: "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.
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.

Question 1mediummultiple choice

Read the full NAT/PAT explanation →

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.

Full breakdown with real-world context →

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.
✓
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 "best", "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.
✗
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.

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: "best", "primary", "minimum / minimize". 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.

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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.