- A
Check the S3 bucket where Patch Manager logs are stored for detailed error messages.
Patch Manager writes logs to S3.
- B
Use the Systems Manager Patch Manager dashboard to view the compliance status for each patch.
Compliance report shows patch-level status.
- C
Review CloudTrail logs for the RunCommand API calls.
Why wrong: CloudTrail logs show API calls but not patch-specific errors.
- D
Verify that the SSM Agent is running and up to date on the failed instances.
The SSM Agent is required for patching.
- E
Use AWS Config to check the configuration history of the instances.
Why wrong: AWS Config does not provide patch failure details.
Question 1,178 of 1,750
Investigate Patch Manager Failures
This DOP-C02 practice question tests your understanding of incident and event response. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company uses AWS Systems Manager Patch Manager to patch its EC2 instances. After a patch window, some instances report a 'Failed' status. The DevOps engineer needs to investigate the cause. Which actions should be taken? (Choose three.)
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
✓
Check the S3 bucket where Patch Manager logs are stored for detailed error messages.
Option A is correct because Patch Manager logs detailed error messages to an S3 bucket, which can be reviewed to identify specific failure reasons. Option B is correct because the Patch Manager dashboard provides a compliance view showing the status of each patch on each instance, helping to identify which patches failed. Option D is correct because the SSM Agent must be running and up to date on each instance for Patch Manager to successfully apply patches; a non-functional agent can cause failures. Option C is wrong because CloudTrail logs API calls like RunCommand, but does not contain detailed patch-level error details. Option E is wrong because AWS Config tracks resource configuration history, not patch failure information.
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.
- ✓
Check the S3 bucket where Patch Manager logs are stored for detailed error messages.
Why this is correct
Patch Manager writes logs to S3.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Use the Systems Manager Patch Manager dashboard to view the compliance status for each patch.
Why this is correct
Compliance report shows patch-level status.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Review CloudTrail logs for the RunCommand API calls.
Why it's wrong here
CloudTrail logs show API calls but not patch-specific errors.
- ✓
Verify that the SSM Agent is running and up to date on the failed instances.
Why this is correct
The SSM Agent is required for patching.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use AWS Config to check the configuration history of the instances.
Why it's wrong here
AWS Config does not provide patch failure details.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
CloudTrail logs show API calls but not patch-specific errors.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
Got this wrong? Here's your next step.
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
- →
Incident and Event Response — study guide chapter
Learn the concepts, then practise the questions
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Incident and Event Response practice questions
Targeted practice on this topic area only
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AWS Certified DevOps Engineer Professional DOP-C02 study guide
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Incident and Event Response — This question tests Incident and Event Response — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Check the S3 bucket where Patch Manager logs are stored for detailed error messages. — Option A is correct because Patch Manager logs detailed error messages to an S3 bucket, which can be reviewed to identify specific failure reasons. Option B is correct because the Patch Manager dashboard provides a compliance view showing the status of each patch on each instance, helping to identify which patches failed. Option D is correct because the SSM Agent must be running and up to date on each instance for Patch Manager to successfully apply patches; a non-functional agent can cause failures. Option C is wrong because CloudTrail logs API calls like RunCommand, but does not contain detailed patch-level error details. Option E is wrong because AWS Config tracks resource configuration history, not patch failure information.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
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