The answer is that the instances lack the AWS Systems Manager Agent (SSM Agent) and the required IAM role. For Systems Manager to manage an EC2 instance, the SSM Agent must be installed and running, and the instance’s IAM role must grant permissions for Systems Manager actions, such as those in the `AmazonSSMManagedInstanceCore` policy. Without both, the instance is invisible to Systems Manager, so automation documents like `AWS-RunPatchBaseline` will skip it even if they execute successfully. On the DOP-C02 exam, this question tests your understanding of the prerequisites for managed instances—a common trap is assuming that only the agent or only the role is needed. Remember the two-part rule: Agent + IAM = Managed. If patching fails silently, always verify both are present before troubleshooting the automation document itself.
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. 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 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.
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 B is correct: SSM Agent must be installed and the instance must have an IAM role that allows Systems Manager actions. Option A is not a requirement. Option C is not required. Option D is incorrect.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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
Static NAT maps one inside address to one outside address.
✗
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: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
SDLC Automation — This question tests SDLC Automation — Static NAT maps one inside address to one outside address..
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 B is correct: SSM Agent must be installed and the instance must have an IAM role that allows Systems Manager actions. Option A is not a requirement. Option C is not required. Option D is incorrect.
What should I do if I get this DOP-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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Question Discussion
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