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Security Logging and Monitoring →mediumMultiple ChoiceObjective-mapped

SCS-C02 Security Logging and Monitoring Practice Question

This SCS-C02 practice question tests your understanding of security logging and monitoring. 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 DevOps engineer notices that an EC2 instance's CloudWatch agent is not sending custom metrics to CloudWatch. The agent is installed and the configuration file is valid. The instance has an IAM role attached. What is the most likely reason for the failure?

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 instance does not have internet access to reach CloudWatch endpoints.
Why wrong: If using a VPC, a VPC endpoint or NAT gateway is needed, but the question does not indicate network issues.
B
The CloudWatch agent is not running as root.
Why wrong: The agent does not require root; it runs as the cwagent user.
C
The CloudWatch agent configuration file has a syntax error.
Why wrong: The question states the configuration file is valid.
D
The IAM role attached to the instance does not have the cloudwatch:PutMetricData permission.
The CloudWatch agent requires the CloudWatchAgentServerPolicy or equivalent with PutMetricData.

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 IAM role attached to the instance does not have the cloudwatch:PutMetricData permission.

Option D is correct because the CloudWatch agent requires IAM permissions to publish custom metrics. Even if the agent is installed, running, and has a valid configuration, it will fail to send metrics if the attached IAM role lacks the `cloudwatch:PutMetricData` action. This is a common misconfiguration where the instance has an IAM role, but the role's policy does not explicitly grant the necessary CloudWatch write permissions.

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 instance does not have internet access to reach CloudWatch endpoints.
Why it's wrong here
If using a VPC, a VPC endpoint or NAT gateway is needed, but the question does not indicate network issues.
✗
The CloudWatch agent is not running as root.
Why it's wrong here
The agent does not require root; it runs as the cwagent user.
✗
The CloudWatch agent configuration file has a syntax error.
Why it's wrong here
The question states the configuration file is valid.
✓
The IAM role attached to the instance does not have the cloudwatch:PutMetricData permission.
Why this is correct
The CloudWatch agent requires the CloudWatchAgentServerPolicy or equivalent with PutMetricData.
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.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates assume internet access is required for CloudWatch communication, but AWS services can be reached via VPC endpoints or private links without internet, and the question's focus on IAM permissions is the key differentiator.

Detailed technical explanation

How to think about this question

The CloudWatch agent uses the AWS SDK to make API calls to the CloudWatch `PutMetricData` endpoint (HTTPS on port 443). The IAM role's trust policy allows the EC2 instance to assume the role, but the permissions policy must include `cloudwatch:PutMetricData` (and optionally `cloudwatch:PutMetricStream` for streaming). Without this permission, the SDK returns an `AccessDeniedException`, which the agent logs but does not retry indefinitely. In real-world scenarios, this often occurs when a DevOps engineer attaches a generic EC2 role (e.g., `AmazonSSMManagedInstanceCore`) that lacks CloudWatch write permissions.

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 SCS-C02 question test?

Security Logging and Monitoring — This question tests Security Logging and Monitoring — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The IAM role attached to the instance does not have the cloudwatch:PutMetricData permission. — Option D is correct because the CloudWatch agent requires IAM permissions to publish custom metrics. Even if the agent is installed, running, and has a valid configuration, it will fail to send metrics if the attached IAM role lacks the `cloudwatch:PutMetricData` action. This is a common misconfiguration where the instance has an IAM role, but the role's policy does not explicitly grant the necessary CloudWatch write permissions.

What should I do if I get this SCS-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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This SCS-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SCS-C02 exam.