- A
Deploy resources across multiple Availability Zones within a single Region
Why wrong: Multi-AZ protects against AZ-level failures within a Region — a regional disaster (natural disaster, widespread outage) affects all AZs simultaneously.
- B
Deploy the application in multiple AWS Regions with Route 53 failover routing
Multi-Region deployment with Route 53 health-check-based failover routing enables automatic traffic redirection to a healthy Region if the primary Region becomes unavailable.
- C
Use Reserved Instances in a single Region for guaranteed capacity
Why wrong: Reserved Instances provide pricing discounts and capacity reservation in a single Region — they don't provide geographic redundancy.
- D
Enable S3 versioning in a single Region
Why wrong: S3 versioning preserves object history within a single bucket — it doesn't replicate data to another Region for disaster recovery.
Quick Answer
The answer is deploying the application in multiple AWS Regions with Route 53 failover routing. This approach achieves multi-region fault tolerance because Route 53 failover routing continuously monitors the health of your endpoints across different geographic Regions; if an entire AWS Region becomes unavailable, DNS traffic is automatically rerouted to a healthy Region, ensuring no single point of failure exists. On the AWS Certified Cloud Practitioner CLF-C02 exam, this concept tests your understanding of the difference between high availability within a single Region (using multiple Availability Zones) and true disaster recovery across Regions. A common trap is confusing multi-AZ deployments with multi-Region fault tolerance—remember that Availability Zones cannot protect against a Region-wide outage. For a quick memory tip, think “Regions for resilience, Zones for redundancy.”
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and services. 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 uses AWS and wants to make their application fault tolerant against the failure of an entire AWS Region. Which approach achieves Region-level fault tolerance?
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
Deploy the application in multiple AWS Regions with Route 53 failover routing
Option B is correct because deploying the application in multiple AWS Regions and using Route 53 failover routing ensures that if an entire Region becomes unavailable, traffic is automatically redirected to a healthy Region. This is the only approach that provides fault tolerance against a complete Region failure, as Availability Zones within a single Region cannot protect against a Region-wide 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.
- ✗
Deploy resources across multiple Availability Zones within a single Region
Why it's wrong here
Multi-AZ protects against AZ-level failures within a Region — a regional disaster (natural disaster, widespread outage) affects all AZs simultaneously.
- ✓
Deploy the application in multiple AWS Regions with Route 53 failover routing
Why this is correct
Multi-Region deployment with Route 53 health-check-based failover routing enables automatic traffic redirection to a healthy Region if the primary Region becomes unavailable.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use Reserved Instances in a single Region for guaranteed capacity
Why it's wrong here
Reserved Instances provide pricing discounts and capacity reservation in a single Region — they don't provide geographic redundancy.
- ✗
Enable S3 versioning in a single Region
Why it's wrong here
S3 versioning preserves object history within a single bucket — it doesn't replicate data to another Region for disaster recovery.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse high availability within a Region (using multiple Availability Zones) with disaster recovery across Regions, and incorrectly assume that deploying across Availability Zones alone provides Region-level fault tolerance.
Detailed technical explanation
How to think about this question
Route 53 failover routing uses health checks to monitor the endpoints in each Region; if a health check fails (e.g., due to a Region outage), Route 53 automatically updates DNS records to point to the healthy Region. The failover mechanism relies on DNS TTL values (typically 60 seconds or less) to propagate the change, and can be combined with active-passive or active-active architectures for different recovery time objectives. In a real-world scenario, a company might use cross-Region replication for databases (e.g., Amazon RDS cross-Region read replicas) alongside Route 53 failover to ensure data consistency and minimal data loss.
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
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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 Technology and Services — This question tests Cloud Technology and Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy the application in multiple AWS Regions with Route 53 failover routing — Option B is correct because deploying the application in multiple AWS Regions and using Route 53 failover routing ensures that if an entire Region becomes unavailable, traffic is automatically redirected to a healthy Region. This is the only approach that provides fault tolerance against a complete Region failure, as Availability Zones within a single Region cannot protect against a Region-wide 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.
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 →
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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