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Question 621 of 1,733

Operations and Maintenance →mediumMultiple ChoiceObjective-mapped

Troubleshoot SSM Agent Issues During SAP Patching

This PAS-C01 practice question tests your understanding of operations and maintenance. 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.

A company is using AWS Systems Manager to automate patching of EC2 instances. The patch baseline includes both security and non-security updates. The Operations team notices that some instances are not patching within the scheduled maintenance window. What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The maintenance window schedule is set to a different time zone.
Why wrong: Time zone differences would affect all instances in the same way, not cause partial failures.
B
The instances do not have an IAM instance profile attached.
Why wrong: Without the correct IAM role, Systems Manager cannot communicate with the instances at all.
C
The SSM Agent on the instances is outdated.
An outdated SSM Agent may fail to execute patching commands even if other prerequisites are met.
D
The patch baseline is configured in the wrong AWS Region.
Why wrong: If the patch baseline is in the wrong Region, instances in that Region would not be patched at all, not just some.

Full breakdown with real-world context →

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The SSM Agent on the instances is outdated.

Option C is correct because Systems Manager Patch Manager requires the SSM Agent to be installed and updated; an outdated agent can fail to apply patches. Option A is incorrect because a maintenance window time zone mismatch would affect all instances uniformly, not just some. Option B is incorrect because while an IAM instance profile is required for Systems Manager to manage instances, its absence would prevent any patching, not just occasional failures. Option D is incorrect because a patch baseline in the wrong Region would only affect instances in that Region, not a subset of instances across multiple Regions.

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 maintenance window schedule is set to a different time zone.
Why it's wrong here
Time zone differences would affect all instances in the same way, not cause partial failures.
✗
The instances do not have an IAM instance profile attached.
Why it's wrong here
Without the correct IAM role, Systems Manager cannot communicate with the instances at all.
✓
The SSM Agent on the instances is outdated.
Why this is correct
An outdated SSM Agent may fail to execute patching commands even if other prerequisites are met.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The patch baseline is configured in the wrong AWS Region.
Why it's wrong here
If the patch baseline is in the wrong Region, instances in that Region would not be patched at all, not just some.

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.

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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.

What to study next

Got this wrong? Here's your next step.

Identify which PAS-C01 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.

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Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

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FAQ

Questions learners often ask

What does this PAS-C01 question test?

Operations and Maintenance — This question tests Operations and Maintenance — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The SSM Agent on the instances is outdated. — Option C is correct because Systems Manager Patch Manager requires the SSM Agent to be installed and updated; an outdated agent can fail to apply patches. Option A is incorrect because a maintenance window time zone mismatch would affect all instances uniformly, not just some. Option B is incorrect because while an IAM instance profile is required for Systems Manager to manage instances, its absence would prevent any patching, not just occasional failures. Option D is incorrect because a patch baseline in the wrong Region would only affect instances in that Region, not a subset of instances across multiple Regions.

What should I do if I get this PAS-C01 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →

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Same concept, more angles

2 more ways this is tested on PAS-C01

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A company uses AWS Systems Manager to automate patching of SAP EC2 instances. The patching fails for some instances with the error 'SSM Agent not running'. What should the administrator do to resolve this?

medium

A.Reboot the instances.
B.Install the Amazon CloudWatch Agent on the instances.
C.Configure a VPC endpoint for Systems Manager.
✓ D.Verify that the SSM Agent is installed and running on the instances.

Why D: The error 'SSM Agent not running' indicates that the AWS Systems Manager Agent is not installed or not running on the instance. The correct action is to verify and ensure the SSM Agent is installed and running. Option A (rebooting) is incorrect because rebooting does not resolve a missing or stopped agent. Option B (installing CloudWatch Agent) is unrelated to Systems Manager patching. Option C (configuring a VPC endpoint) addresses connectivity but not the agent status. Therefore, D is the correct answer.

Variation 2. A company is using AWS Systems Manager to automate patching of SAP EC2 instances. The patching fails for some instances with the error 'Unable to retrieve SSM Agent registration'. What is the MOST likely cause?

easy

A.The patching window is too short and the instance times out.
B.The IAM role attached to the instance does not have permissions to list patches.
✓ C.The instance does not have outbound internet access or a VPC endpoint for Systems Manager.
D.The SSM Agent is not installed because the instance is running in a container.

Why C: The correct answer is C. The error 'Unable to retrieve SSM Agent registration' indicates that the SSM Agent cannot communicate with the Systems Manager service. This typically occurs when the instance lacks outbound internet access or a VPC endpoint for Systems Manager. Option A is incorrect because a patching window timeout would produce a different error. Option B is incorrect because the IAM role permissions issue would cause an access denied error, not a registration failure. Option D is incorrect because the SSM Agent runs on EC2 instances, not containers, and the error is unrelated to container environments.

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