CV0-004 Troubleshooting Practice Question
An administrator deployed a new web application using an auto-scaling group. Users report that the application becomes slow after a few hours. The administrator examines the scaling policy and notices that the CPU utilization threshold is set to 80% for scale-out and 20% for scale-in. What is the most likely issue?
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 threshold is too high, causing delayed scaling
A scale-out threshold of 80% means that new instances are only added when CPU utilization reaches 80%, which can cause delays in scaling out, leading to performance degradation as the application becomes slow over time. Option A is incorrect because a low scale-in threshold of 20% would cause premature termination of instances, not slowness. Option B is incorrect because load balancer misconfiguration would typically cause immediate failures or uneven traffic distribution, not gradual slowdown. Option C is incorrect because a memory leak would cause degradation over time, but the specific symptom of slowness after a few hours combined with the scaling policy thresholds points to the scaling configuration as the primary issue.
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 scale-in threshold is too low, causing instances to be terminated prematurely
Why it's wrong here
A low scale-in threshold would keep more instances running, not cause slowness.
- ✗
The load balancer is misconfigured
Why it's wrong here
Load balancer issues typically cause connection errors or uneven distribution, not gradual slowdown.
- ✗
The application has a memory leak
Why it's wrong here
A memory leak would show increasing memory usage, not necessarily correlated with CPU thresholds.
- ✓
The scale-out threshold is too high, causing delayed scaling
Why this is correct
At 80% CPU, scaling out only occurs after significant load, delaying additional capacity.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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