The answer is that the average statistic over a 300-second period can smooth out spikes, making the overall 75% average misleading despite 15 minutes of idle time. This occurs because CloudWatch’s average metric aggregates data points into five-minute periods, so a brief but intense CPU spike later in the hour raises the mean, effectively masking the idle period. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this tests your understanding of how the period and statistic settings affect metric interpretation—a common trap is assuming a high average implies consistent usage. Remember that a CloudWatch average statistic can hide idle time when spikes are present, so always check the underlying datapoints or use percentile statistics for a clearer picture. Memory tip: “Spikes skew the average—look at the p95 to see the real story.”
SOA-C02 Monitoring, Logging, and Remediation Practice Question
This SOA-C02 practice question tests your understanding of monitoring, logging, and remediation. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
Network Topology
Refer to the exhibit. A SysOps administrator runs the AWS CLI command shown. The output shows that the CPUUtilization average over the period is 75%. However, the administrator knows that the instance was idle for the first 15 minutes of the hour. Which explanation best describes why the average might be misleading?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
The period is too long; a shorter period like 60 seconds would show more granular data.
Why wrong: A shorter period would help, but the question asks why the average is misleading.
B
The average statistic over a period of 300 seconds can smooth out spikes, and the overall average of 75% may be due to a high spike after the idle period.
Averaging over 5-minute periods can mask short spikes, and the overall average over the hour can be misleading if the load is not constant.
C
The command should include --unit Percent to get accurate data.
Why wrong: The unit is already Percent by default.
D
The --statistics parameter should be set to 'Sum' to capture total usage.
Why wrong: Sum would not help; it would sum the averages.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The average statistic over a period of 300 seconds can smooth out spikes, and the overall average of 75% may be due to a high spike after the idle period.
Option B is correct because the average statistic over a 300-second period can smooth out brief but intense spikes in CPU utilization. In this scenario, the instance was idle for the first 15 minutes, so the average of 75% over the entire hour must be driven by a very high CPU spike later in the period. The period of 300 seconds aggregates data into 5-minute intervals, which can mask the idle period and make the overall average misleading.
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 period is too long; a shorter period like 60 seconds would show more granular data.
Why it's wrong here
A shorter period would help, but the question asks why the average is misleading.
✓
The average statistic over a period of 300 seconds can smooth out spikes, and the overall average of 75% may be due to a high spike after the idle period.
Why this is correct
Averaging over 5-minute periods can mask short spikes, and the overall average over the hour can be misleading if the load is not constant.
Clue confirmation
The clue words "best", "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The command should include --unit Percent to get accurate data.
Why it's wrong here
The unit is already Percent by default.
✗
The --statistics parameter should be set to 'Sum' to capture total usage.
Why it's wrong here
Sum would not help; it would sum the averages.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume a high average always indicates consistent high usage, when in fact the 'Average' statistic over a long period can mask idle periods and be heavily skewed by short, intense spikes.
Detailed technical explanation
How to think about this question
CloudWatch metrics are stored as a series of data points with a specified period (e.g., 300 seconds). The 'Average' statistic calculates the mean of all data points within each period, which can hide short-term variations. For example, if the instance spikes to 100% CPU for 30 minutes after being idle for 15 minutes, the average over the hour would be 75%, but the actual utilization pattern is bimodal. This is why monitoring with multiple statistics (e.g., 'Maximum' and 'Average') or using a shorter period is recommended for accurate anomaly detection.
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.
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 average statistic over a period of 300 seconds can smooth out spikes, and the overall average of 75% may be due to a high spike after the idle period. — Option B is correct because the average statistic over a 300-second period can smooth out brief but intense spikes in CPU utilization. In this scenario, the instance was idle for the first 15 minutes, so the average of 75% over the entire hour must be driven by a very high CPU spike later in the period. The period of 300 seconds aggregates data into 5-minute intervals, which can mask the idle period and make the overall average misleading.
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: "best", "first". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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