- A
Auto Scaling scheduled scaling
Why wrong: Scheduled scaling adjusts capacity at specific times — it's not about maintaining minimum health, it's about time-based capacity planning.
- B
Auto Scaling self-healing / instance replacement
Auto Scaling continuously monitors instance health and automatically replaces any instance that fails EC2 or ELB health checks, maintaining the configured minimum capacity.
- C
EC2 Auto Recovery
Why wrong: EC2 Auto Recovery (CloudWatch alarm action) recovers a specific instance with its same instance ID — Auto Scaling launches a new replacement instance, which is a broader self-healing mechanism.
- D
Predictive scaling
Why wrong: Predictive scaling uses ML to forecast demand and pre-scale — it's about capacity planning, not maintaining minimum healthy instances.
Quick Answer
The answer is Auto Scaling self-healing, also known as automatic instance replacement. This feature is correct because Amazon EC2 Auto Scaling continuously monitors the health of each running instance using EC2 status checks or custom health checks; when an instance fails, the Auto Scaling group automatically terminates the unhealthy instance and launches a new one to restore the desired capacity, ensuring a minimum number of healthy instances are always running without any manual intervention. On the AWS Certified Cloud Practitioner CLF-C02 exam, this concept tests your understanding of how Auto Scaling maintains high availability and fault tolerance—a common trap is confusing this with Elastic Load Balancing, which distributes traffic but does not replace instances. A helpful memory tip: think of Auto Scaling as a self-healing immune system that automatically replaces sick cells (unhealthy instances) to keep the body (your application) healthy and resilient.
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.
Which Amazon EC2 Auto Scaling feature ensures a minimum number of healthy instances are always running, replacing terminated instances automatically?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"always"Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
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
Auto Scaling self-healing / instance replacement
Amazon EC2 Auto Scaling's self-healing (instance replacement) feature automatically detects and replaces unhealthy instances to maintain a minimum number of healthy instances. When an instance fails a health check, Auto Scaling terminates it and launches a new one to keep the desired capacity, ensuring high availability 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.
- ✗
Auto Scaling scheduled scaling
Why it's wrong here
Scheduled scaling adjusts capacity at specific times — it's not about maintaining minimum health, it's about time-based capacity planning.
- ✓
Auto Scaling self-healing / instance replacement
Why this is correct
Auto Scaling continuously monitors instance health and automatically replaces any instance that fails EC2 or ELB health checks, maintaining the configured minimum capacity.
Clue confirmation
The clue words "always", "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
EC2 Auto Recovery
Why it's wrong here
EC2 Auto Recovery (CloudWatch alarm action) recovers a specific instance with its same instance ID — Auto Scaling launches a new replacement instance, which is a broader self-healing mechanism.
- ✗
Predictive scaling
Why it's wrong here
Predictive scaling uses ML to forecast demand and pre-scale — it's about capacity planning, not maintaining minimum healthy instances.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse EC2 Auto Recovery (which recovers a single instance) with Auto Scaling self-healing (which replaces instances across the group to maintain minimum healthy count).
Detailed technical explanation
How to think about this question
Under the hood, Auto Scaling uses EC2 status checks and Elastic Load Balancing health checks to determine instance health. When an instance fails the health check, Auto Scaling marks it as unhealthy, terminates it, and launches a replacement to maintain the desired capacity. In a real-world scenario, if an application instance becomes unresponsive due to a memory leak, self-healing ensures a new instance is spun up automatically, preventing downtime without manual intervention.
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.
- →
Cloud Technology and Services — study guide chapter
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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: Auto Scaling self-healing / instance replacement — Amazon EC2 Auto Scaling's self-healing (instance replacement) feature automatically detects and replaces unhealthy instances to maintain a minimum number of healthy instances. When an instance fails a health check, Auto Scaling terminates it and launches a new one to keep the desired capacity, ensuring high availability 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.
Are there clue words in this question I should notice?
Yes — watch for: "always", "minimum / minimize". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
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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