← SOA-C02·Amazon Web Services

Question 693 of 1,546

Deployment, Provisioning, and Automation →mediumMultiple ChoiceObjective-mapped

SSM Agent Installation Required for Patching — Troubleshooting 'Instance Not Supported' | AWS SysOps Associate

This SOA-C02 practice question tests your understanding of deployment, provisioning, and 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 to automate patching of EC2 instances. The SysOps administrator creates a Maintenance Window that targets a list of instances. The patching task fails with the error: 'Instance is not in a supported state.' What should the administrator check FIRST?

Clue words in this question

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

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.

A
Verify that the instance has a public IP address.
Why wrong: Instances can use VPC endpoints without public IP.
B
Verify that the instance's security group allows inbound traffic from Systems Manager.
Why wrong: Systems Manager uses outbound connections, not inbound.
C
Verify that the SSM Agent is installed and running on the instance.
The SSM Agent must be running for Systems Manager to manage the instance.
D
Verify that the instance has an IAM instance profile attached with the necessary permissions.
Why wrong: While IAM permissions are needed, the immediate error 'not in a supported state' typically refers to the agent.

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

✓

Verify that the SSM Agent is installed and running on the instance.

Option C is correct because Systems Manager requires the SSM Agent to be installed and running on the instance to execute patching commands. Option A is incorrect because patching does not require a public IP address; instances can be in a private subnet with appropriate VPC endpoints. Option B is incorrect because the security group does not need to allow inbound traffic from Systems Manager; Systems Manager uses outbound traffic initiated by the SSM Agent. Option D is incorrect because while an IAM instance profile with appropriate permissions is necessary for Systems Manager, the error 'Instance is not in a supported state' specifically indicates that the SSM Agent is not installed or running, so the first thing to check is the agent status.

Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Verify that the instance has a public IP address.
Why it's wrong here
Instances can use VPC endpoints without public IP.
✗
Verify that the instance's security group allows inbound traffic from Systems Manager.
Why it's wrong here
Systems Manager uses outbound connections, not inbound.
✓
Verify that the SSM Agent is installed and running on the instance.
Why this is correct
The SSM Agent must be running for Systems Manager to manage the instance.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.
✗
Verify that the instance has an IAM instance profile attached with the necessary permissions.
Why it's wrong here
While IAM permissions are needed, the immediate error 'not in a supported state' typically refers to the agent.

Common exam traps

Common exam trap: usable hosts are not the same as total addresses

Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.

Detailed technical explanation

How to think about this question

Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.

KKey Concepts to Remember

CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.

TExam Day Tips

Write the block size before choosing the subnet.
Check whether the question asks for hosts, subnets or a specific address range.
Do not confuse /24, /25, /26 and /27 host counts.

Key takeaway

Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

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.

Visual reference

What to study next

Got this wrong? Here's your next step.

Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SOA-C02 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this SOA-C02 question test?

Deployment, Provisioning, and Automation — This question tests Deployment, Provisioning, and Automation — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Verify that the SSM Agent is installed and running on the instance. — Option C is correct because Systems Manager requires the SSM Agent to be installed and running on the instance to execute patching commands. Option A is incorrect because patching does not require a public IP address; instances can be in a private subnet with appropriate VPC endpoints. Option B is incorrect because the security group does not need to allow inbound traffic from Systems Manager; Systems Manager uses outbound traffic initiated by the SSM Agent. Option D is incorrect because while an IAM instance profile with appropriate permissions is necessary for Systems Manager, the error 'Instance is not in a supported state' specifically indicates that the SSM Agent is not installed or running, so the first thing to check is the agent status.

What should I do if I get this SOA-C02 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

What is the key concept behind this question?

CIDR notation defines the prefix length.

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