- A
Manual restart procedures documented in a runbook
Why wrong: Manual procedures don't implement automatic recovery — they require human intervention and increase recovery time.
- B
EC2 Auto Scaling + ELB health checks + RDS Multi-AZ
Auto Scaling automatically replaces failed instances, ELB health checks remove unhealthy targets from rotation, and RDS Multi-AZ automatically fails over the database — full automatic recovery without human intervention.
- C
AWS CloudTrail + Amazon CloudWatch
Why wrong: CloudTrail and CloudWatch provide logging and alerting — they detect failures but don't automatically recover from them.
- D
AWS Config rules with manual remediation
Why wrong: Config rules detect configuration drift — manual remediation doesn't implement automatic recovery.
How to Automatically Recover from Failure in AWS?
This CLF-C02 practice question tests your understanding of cloud concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 is designing a resilient multi-tier web application on AWS. The architect wants to implement the Well-Architected Framework Reliability pillar design principle of 'automatically recover from failure.' Which combination of services implements this most completely?
Quick Answer
The answer is EC2 Auto Scaling, ELB health checks, and RDS Multi-AZ working together. This combination most completely implements the Well-Architected Reliability pillar principle of automatically recovering from failure because it creates a self-healing architecture across both compute and database tiers: Auto Scaling replaces failed EC2 instances automatically, ELB health checks detect unhealthy targets and reroute traffic, and RDS Multi-AZ provides automatic database failover to a standby in another Availability Zone. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your understanding that true automatic recovery requires orchestrated services, not just one—a common trap is choosing only Auto Scaling or only Multi-AZ, missing the layered approach. For the search intent "automatically recover from failure aws services," remember that AWS defines recovery as a combination of detection, traffic redirection, and replacement. A useful memory tip is "Triple-A Recovery": Auto Scaling, ALB/ELB health checks, and AZ failover for RDS.
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
EC2 Auto Scaling + ELB health checks + RDS Multi-AZ
Option B is correct because it combines EC2 Auto Scaling to automatically replace unhealthy instances, ELB health checks to detect failures and route traffic away from them, and RDS Multi-AZ to automatically failover to a standby database in a different Availability Zone. This trio directly implements the 'automatically recover from failure' principle by enabling self-healing at both the compute and database tiers without manual intervention.
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.
- ✗
Manual restart procedures documented in a runbook
Why it's wrong here
Manual procedures don't implement automatic recovery — they require human intervention and increase recovery time.
- ✓
EC2 Auto Scaling + ELB health checks + RDS Multi-AZ
Why this is correct
Auto Scaling automatically replaces failed instances, ELB health checks remove unhealthy targets from rotation, and RDS Multi-AZ automatically fails over the database — full automatic recovery without human intervention.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS CloudTrail + Amazon CloudWatch
Why it's wrong here
CloudTrail and CloudWatch provide logging and alerting — they detect failures but don't automatically recover from them.
- ✗
AWS Config rules with manual remediation
Why it's wrong here
Config rules detect configuration drift — manual remediation doesn't implement automatic recovery.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse monitoring services (like CloudTrail and CloudWatch) with recovery services, failing to recognize that detection alone does not satisfy the 'automatically recover' principle unless paired with an automated action mechanism such as Auto Scaling or Multi-AZ failover.
Detailed technical explanation
How to think about this question
Under the hood, ELB health checks use TCP or HTTP health probes at configurable intervals (e.g., every 10 seconds) to determine instance health; when an instance fails consecutive checks, the load balancer stops routing traffic to it and Auto Scaling triggers a scale-in event to terminate the unhealthy instance and launch a new one. For RDS Multi-AZ, synchronous replication to the standby instance occurs at the storage layer, and failover is automatically initiated by Amazon's DNS-based routing within 60–120 seconds, with no changes needed to the application connection string. This layered recovery approach ensures that even if an entire Availability Zone fails, the application remains available with minimal downtime.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
- →
Cloud Concepts — study guide chapter
Learn the concepts, then practise the questions
- →
Cloud Concepts practice questions
Targeted practice on this topic area only
- →
All CLF-C02 questions
1,024 questions across all exam domains
- →
AWS Certified Cloud Practitioner CLF-C02 study guide
Full concept coverage aligned to exam objectives
- →
CLF-C02 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related CLF-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Cloud Concepts practice questions
Practise CLF-C02 questions linked to Cloud Concepts.
Security and Compliance practice questions
Practise CLF-C02 questions linked to Security and Compliance.
Cloud Technology and Services practice questions
Practise CLF-C02 questions linked to Cloud Technology and Services.
Billing, Pricing, and Support practice questions
Practise CLF-C02 questions linked to Billing, Pricing, and Support.
AWS shared responsibility model practice questions
Practise CLF-C02 questions linked to AWS shared responsibility model.
AWS IAM practice questions
Practise CLF-C02 questions linked to AWS IAM.
AWS pricing practice questions
Practise CLF-C02 questions linked to AWS pricing.
AWS support plans practice questions
Practise CLF-C02 questions linked to AWS support plans.
AWS S3 practice questions
Practise CLF-C02 questions linked to AWS S3.
AWS EC2 practice questions
Practise CLF-C02 questions linked to AWS EC2.
Practice this exam
Start a free CLF-C02 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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: EC2 Auto Scaling + ELB health checks + RDS Multi-AZ — Option B is correct because it combines EC2 Auto Scaling to automatically replace unhealthy instances, ELB health checks to detect failures and route traffic away from them, and RDS Multi-AZ to automatically failover to a standby database in a different Availability Zone. This trio directly implements the 'automatically recover from failure' principle by enabling self-healing at both the compute and database tiers without manual intervention.
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 →
Keep practising
More CLF-C02 practice questions
- A company publishes a message each time a new product is added to its catalogue. Three services need to receive this mes…
- A media company stores frequently accessed video thumbnails in Amazon S3. The thumbnails are read multiple times every d…
- A company needs a service to translate domain names (like www.example.com) into IP addresses, check the health of their…
- A startup runs an application on AWS and receives a monthly bill that charges exactly for the number of compute hours us…
- A financial institution runs its core banking application on-premises due to regulatory requirements. It has connected i…
- A company wants to run a MySQL database in AWS without managing database software installation, applying patches, settin…
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.