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SDLC Automation →easyMultiple ChoiceObjective-mapped

DOP-C02 SDLC Automation Practice Question

This DOP-C02 practice question tests your understanding of sdlc automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 Automation to patch EC2 instances. The automation document 'AWS-RunPatchBaseline' runs successfully but some instances are not patched because they are not managed by Systems Manager. What is the most likely reason?

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 instances are running Windows Server 2012 or older.
Why wrong: SSM Agent is available for older versions as well.
B
The instances are in a VPC without internet access.
Why wrong: Instances can use VPC endpoints to communicate with Systems Manager without internet.
C
The instances do not have the AWS Systems Manager Agent (SSM Agent) installed and the required IAM role attached.
Systems Manager requires the SSM Agent to be installed and an IAM role that permits Systems Manager actions (e.g., AmazonSSMManagedInstanceCore).
D
The automation document is not compatible with the instance's operating system.
Why wrong: AWS-RunPatchBaseline supports multiple OSes.

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 instances do not have the AWS Systems Manager Agent (SSM Agent) installed and the required IAM role attached.

Option C is correct because Systems Manager Automation can only patch instances that are managed by Systems Manager. For an instance to be managed, it must have the SSM Agent installed and running, and it must have an IAM role that grants the necessary permissions (e.g., AmazonSSMManagedInstanceCore) to communicate with the Systems Manager service. Without these prerequisites, the instance is not registered as a managed node, so the automation document cannot target or patch it.

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 instances are running Windows Server 2012 or older.
Why it's wrong here
SSM Agent is available for older versions as well.
✗
The instances are in a VPC without internet access.
Why it's wrong here
Instances can use VPC endpoints to communicate with Systems Manager without internet.
✓
The instances do not have the AWS Systems Manager Agent (SSM Agent) installed and the required IAM role attached.
Why this is correct
Systems Manager requires the SSM Agent to be installed and an IAM role that permits Systems Manager actions (e.g., AmazonSSMManagedInstanceCore).
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 automation document is not compatible with the instance's operating system.
Why it's wrong here
AWS-RunPatchBaseline supports multiple OSes.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may assume patching failures are due to network connectivity or OS compatibility, when the root cause is almost always the missing SSM Agent or missing IAM role that prevents the instance from being managed by Systems Manager.

Detailed technical explanation

How to think about this question

Under the hood, the SSM Agent uses the AWS Systems Manager service endpoint (ssm.<region>.amazonaws.com) to register the instance and receive commands. The agent must be able to authenticate via the instance's attached IAM role (using the instance metadata service) to obtain temporary credentials. If the agent is missing or the role lacks the required permissions (e.g., ssm:UpdateInstanceInformation), the instance never appears in the managed instances list, and automation documents cannot target it. A real-world scenario is when an EC2 instance is launched without the SSM Agent pre-installed (e.g., using a custom AMI) or without an appropriate IAM role, leading to silent failures in patching automation.

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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The instances do not have the AWS Systems Manager Agent (SSM Agent) installed and the required IAM role attached. — Option C is correct because Systems Manager Automation can only patch instances that are managed by Systems Manager. For an instance to be managed, it must have the SSM Agent installed and running, and it must have an IAM role that grants the necessary permissions (e.g., AmazonSSMManagedInstanceCore) to communicate with the Systems Manager service. Without these prerequisites, the instance is not registered as a managed node, so the automation document cannot target or patch it.

What should I do if I get this DOP-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: "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.

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