This CV0-004 practice question tests your understanding of operations and support. 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 cloud administrator is reviewing cost reports and notices that a development environment is incurring high costs due to idle compute resources. The environment is used only during business hours on weekdays. Which of the following actions would MOST effectively reduce costs?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement an auto-scaling schedule to shut down instances during off-hours.
An auto-scaling schedule allows you to define time-based rules to automatically scale in (terminate) instances during off-hours and scale out (launch) them during business hours. This directly addresses the idle compute waste by ensuring resources are only running when needed, which is the most effective cost reduction strategy for a predictable usage pattern like weekdays 9-to-5.
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.
✓
Implement an auto-scaling schedule to shut down instances during off-hours.
Why this is correct
This stops instances when not in use, significantly reducing costs without impacting availability during business hours.
Related concept
Read the scenario before looking for a memorised answer.
✗
Move the development environment to a different region with lower costs.
Why it's wrong here
Moving regions is complex and may not address the core issue of idle resources.
✗
Change all instances to smaller instance types.
Why it's wrong here
Smaller instances may not provide sufficient resources for development work during peak usage.
✗
Use spot instances for all development servers.
Why it's wrong here
Spot instances can be terminated at any time, which is unsuitable for development environments needing persistence.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between reducing per-unit cost (e.g., smaller instances, spot, different region) versus reducing total runtime cost, and the trap here is that candidates choose a cost-reduction method that still leaves resources running 24/7 instead of aligning compute with actual usage patterns.
Detailed technical explanation
How to think about this question
Auto-scaling scheduled actions use the AWS Application Auto Scaling API (or equivalent in Azure/GCP) to set min, max, and desired capacity at specific times. Under the hood, this triggers a CloudWatch alarm or cron-like event that calls the UpdateAutoScalingGroup action, which then launches or terminates EC2 instances via the ASG lifecycle hooks. A subtle behavior: if you set the desired capacity to 0 during off-hours, the ASG will terminate all instances, but you must ensure that any attached EBS volumes set to 'delete on termination' are properly handled to avoid data loss.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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.
Operations and Support — This question tests Operations and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Implement an auto-scaling schedule to shut down instances during off-hours. — An auto-scaling schedule allows you to define time-based rules to automatically scale in (terminate) instances during off-hours and scale out (launch) them during business hours. This directly addresses the idle compute waste by ensuring resources are only running when needed, which is the most effective cost reduction strategy for a predictable usage pattern like weekdays 9-to-5.
What should I do if I get this CV0-004 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.
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Question Discussion
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