The correct answer is right-sizing underutilized resources, as this Azure cost optimization practice directly targets waste by analyzing usage metrics like CPU, memory, and disk I/O to either resize virtual machines to a smaller SKU or deallocate idle instances. This aligns capacity with actual demand, reducing compute, storage, and licensing costs that would otherwise be spent on over-provisioned resources. On the AZ-900 exam, this concept tests your understanding of the five pillars of the Microsoft Cost Management framework, often appearing in scenario-based questions where you must identify the best action for reducing spend on a low-usage VM. A common trap is confusing right-sizing with scaling out—remember that right-sizing adjusts the size of existing resources, not the number of instances. For a quick memory tip, think “trim the fat, not the fleet”—right-sizing cuts capacity, not count.
AZ-900 Describe Azure management and governance Practice Question
This AZ-900 practice question tests your understanding of describe azure management and governance. 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.
Which Azure cost optimization practice involves analyzing resource usage and removing or resizing underutilized resources?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Right-sizing underutilized resources
Right-sizing underutilized resources is a core Azure cost optimization practice that involves analyzing resource usage metrics (e.g., CPU, memory, disk I/O) and then either resizing to a smaller SKU or deallocating idle resources. This directly reduces compute, storage, and licensing costs by aligning capacity with actual demand, as opposed to paying for over-provisioned capacity.
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.
✗
Reserved Instance purchasing
Why it's wrong here
Reserved Instances pre-purchase capacity at discounts; right-sizing is about optimizing resource size.
✓
Right-sizing underutilized resources
Why this is correct
Right-sizing analyzes usage and resizes overprovisioned resources to their actual needed capacity.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enabling geo-redundant storage
Why it's wrong here
Geo-redundant storage increases costs for data protection, not a cost optimization technique.
✗
Using Premium SSD disks for all workloads
Why it's wrong here
Using Premium SSDs for all workloads increases costs; right-sizing might suggest using cheaper disk tiers for non-critical workloads.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'right-sizing' with 'Reserved Instances' because both reduce costs, but Reserved Instances are a commitment-based discount model, not an analysis-driven resizing practice.
Detailed technical explanation
How to think about this question
Azure Advisor provides a 'Cost' recommendation blade that analyzes telemetry from the Azure Monitor Metrics (e.g., CPU utilization over 7–30 days) and flags VMs with average CPU usage below 5% and network throughput below 7 MB/s as candidates for right-sizing or shutdown. The actual resizing operation uses the Azure Resource Manager API to change the VM size, which may require a reboot and can affect availability if the target SKU is not supported in the same availability set or region.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-900 question in full detail.
Describe Azure management and governance — This question tests Describe Azure management and governance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Right-sizing underutilized resources — Right-sizing underutilized resources is a core Azure cost optimization practice that involves analyzing resource usage metrics (e.g., CPU, memory, disk I/O) and then either resizing to a smaller SKU or deallocating idle resources. This directly reduces compute, storage, and licensing costs by aligning capacity with actual demand, as opposed to paying for over-provisioned capacity.
What should I do if I get this AZ-900 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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