CV0-004 Troubleshooting Practice Question
A cloud administrator manages a web application that uses an auto scaling group (ASG) with a minimum of 2 and maximum of 10 instances. The CPU utilization for the ASG averages 40%. However, during peak hours, users experience intermittent timeouts. The administrator reviews the scaling policy, which is set to scale out when CPU exceeds 70% for 5 minutes. What is the most likely cause of the timeouts?
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 scale-out cooldown period is too long, delaying the addition of new instances.
During peak hours, CPU utilization may spike quickly, but the scaling policy requires CPU to exceed 70% for 5 minutes before triggering a scale-out. If the scale-out cooldown period is too long, additional instances are delayed, causing the existing instances to become overloaded and leading to timeouts. Option A is incorrect because the maximum of 10 instances is likely sufficient; the problem is the speed of scaling. Option B is incorrect because health check failures would cause instance replacement, not timeouts from overload. Option C is incorrect because a 70% threshold is not too low; a lower threshold would cause premature scaling, not timeouts.
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 maximum number of instances is too low.
Why it's wrong here
Max is 10, which is typically sufficient; the issue is that scaling is not triggered quickly enough.
- ✗
The health checks are marking healthy instances as unhealthy.
Why it's wrong here
This would cause instance termination, not timeouts.
- ✗
The CPU threshold is too low, causing premature scaling.
Why it's wrong here
The threshold is 70%, which is not low; average CPU is 40%.
- ✓
The scale-out cooldown period is too long, delaying the addition of new instances.
Why this is correct
A long cooldown delays scaling during rapid spikes, leading to timeouts.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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