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Question 158 of 1,546

Monitoring, Logging, and Remediation →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is that an overly long cooldown period is the most likely cause when Auto Scaling fails to launch new instances despite sustained high CPU utilization. After a scaling activity completes, the Auto Scaling group enters a cooldown period that temporarily blocks all subsequent scaling actions, even if the CloudWatch alarm remains in ALARM state. If this cooldown is set too long—for example, 600 seconds or more—the group simply waits out the timer, ignoring the persistent high load. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of how cooldowns interact with scaling policies and alarm states; a common trap is assuming the alarm itself is broken or that the metric is misconfigured. Remember the key distinction: a cooldown prevents the policy from executing, not the alarm from triggering. For a quick memory tip, think “Cool Down, No Launch”—the cooldown timer overrides the alarm’s urgency.

SOA-C02 Monitoring, Logging, and Remediation Practice Question

This SOA-C02 practice question tests your understanding of monitoring, logging, and remediation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 SysOps administrator notices that an EC2 instance's CPU utilization is consistently above 90% during business hours. The instance is part of an Auto Scaling group with a scaling policy based on average CPU utilization. Despite high utilization, no scaling events are triggered. What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Question 1mediummultiple choice

Full question →

A
The scaling policy has a cooldown period that is too long, preventing new scaling activities.
A long cooldown period can delay or prevent scaling actions, even if the metric is high.
B
The instance type is not supported by the Auto Scaling group's launch configuration.
Why wrong: An unsupported instance type would cause launch failures, not prevent scaling based on CPU.
C
The CloudWatch alarm is in the ALARM state but the Auto Scaling group has a suspended process for Add instances.
Why wrong: A suspended process would prevent scaling, but the alarm state is irrelevant; the question implies no alarm triggers.
D
The Auto Scaling group's health check type is set to ELB, causing the instance to be marked unhealthy.
Why wrong: Health check type affects instance health, not scaling based on CPU utilization.

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

✓

The scaling policy has a cooldown period that is too long, preventing new scaling activities.

The most likely cause is that the scaling policy has a cooldown period that is too long. After a scaling activity completes, the Auto Scaling group enters a cooldown period that prevents additional scaling activities from being triggered until the cooldown expires. If the cooldown period is set too long (e.g., 600 seconds or more), the group will not launch new instances even if the CloudWatch alarm remains in ALARM state with high CPU utilization, because the scaling policy is blocked from executing.

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.

✓
The scaling policy has a cooldown period that is too long, preventing new scaling activities.
Why this is correct
A long cooldown period can delay or prevent scaling actions, even if the metric is high.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The instance type is not supported by the Auto Scaling group's launch configuration.
Why it's wrong here
An unsupported instance type would cause launch failures, not prevent scaling based on CPU.
✗
The CloudWatch alarm is in the ALARM state but the Auto Scaling group has a suspended process for Add instances.
Why it's wrong here
A suspended process would prevent scaling, but the alarm state is irrelevant; the question implies no alarm triggers.
✗
The Auto Scaling group's health check type is set to ELB, causing the instance to be marked unhealthy.
Why it's wrong here
Health check type affects instance health, not scaling based on CPU utilization.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often assume a scaling policy will always trigger when the CloudWatch alarm is in ALARM state, overlooking the cooldown period as a deliberate throttling mechanism that can prevent scaling activities from being initiated.

Detailed technical explanation

How to think about this question

The cooldown period is a configurable setting (default 300 seconds) that helps stabilize the Auto Scaling group by preventing rapid, successive scaling actions. When a scaling policy triggers a scaling activity, the cooldown timer starts, and during that period, any subsequent alarm breaches are ignored for that policy. In real-world scenarios, if the cooldown is set too high (e.g., 900 seconds), the group cannot react quickly to sustained high load, leading to performance degradation. The cooldown applies per scaling policy, not per instance, so even if the alarm remains in ALARM, the policy will not execute until the cooldown expires.

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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

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 SOA-C02 question test?

Monitoring, Logging, and Remediation — This question tests Monitoring, Logging, and Remediation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The scaling policy has a cooldown period that is too long, preventing new scaling activities. — The most likely cause is that the scaling policy has a cooldown period that is too long. After a scaling activity completes, the Auto Scaling group enters a cooldown period that prevents additional scaling activities from being triggered until the cooldown expires. If the cooldown period is set too long (e.g., 600 seconds or more), the group will not launch new instances even if the CloudWatch alarm remains in ALARM state with high CPU utilization, because the scaling policy is blocked from executing.

What should I do if I get this SOA-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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Same concept, more angles

1 more ways this is tested on SOA-C02

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A SysOps administrator notices that an EC2 instance's CPU utilization has been above 90% for the past hour. The instance is part of an Auto Scaling group with a CPU utilization-based scaling policy. However, no new instances have been launched. What is the most likely cause?

easy

✓ A.The Auto Scaling cooldown period is preventing additional scaling activities.
B.The EC2 instance is in a private subnet and cannot communicate with the Auto Scaling service.
C.The CloudWatch alarm is publishing to an S3 bucket that is full.
D.The scaling policy is based on memory utilization, not CPU.

Why A: The most likely cause is that the Auto Scaling cooldown period is preventing additional scaling activities. When a scaling activity completes, a cooldown period (default 300 seconds) starts during which the Auto Scaling group ignores additional CloudWatch alarms to allow metrics to stabilize. If the instance has been above 90% CPU for an hour but no new instances launched, the cooldown period may have been triggered by a previous scaling event and is still active, blocking further scale-out actions despite sustained high utilization.

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Question Discussion

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