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DBS-C01 Database Security Practice Question

Network Topology
aws iam get-role-policyrole-name rds-monitoring-rolepolicy-name rds-monitoring-policyRefer to the exhibit."RoleName": "rds-monitoring-role","PolicyName": "rds-monitoring-policy","PolicyDocument": {"Version": "2012-10-17","Statement": ["Effect": "Allow","Action": ["monitoring:PutMetricData","monitoring:GetMetricData","rds:DescribeDBInstances"],"Resource": "*"

A database administrator is troubleshooting why Amazon RDS Enhanced Monitoring is not displaying metrics for a DB instance. The IAM role attached to the instance has the policy shown in the exhibit. What is the likely cause?

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 policy denies the 'rds:DescribeDBInstances' action.

Amazon RDS Enhanced Monitoring requires the IAM role to have permission to describe the DB instance using 'rds:DescribeDBInstances'. This action is necessary for the monitoring service to retrieve information about the instance so it can collect and publish OS metrics. If the policy explicitly denies this action, Enhanced Monitoring will fail to display metrics. Option C is incorrect because 'monitoring:ListMetrics' is not required; Enhanced Monitoring publishes to CloudWatch Logs, not CloudWatch Metrics, and the IAM role needs logs permissions (e.g., 'logs:PutLogEvents') rather than monitoring actions. Options B and D are also incorrect: 'rds:CreateDBInstance' is unrelated to monitoring, and using a resource of '*' is acceptable as long as the trust policy allows RDS to assume the role.

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 policy denies the 'rds:DescribeDBInstances' action.

    Why this is correct

    Correct. Denying 'rds:DescribeDBInstances' would prevent Enhanced Monitoring from retrieving instance details necessary to publish metrics.

  • ✗

    The policy is missing the 'rds:CreateDBInstance' action.

    Why it's wrong here

    Incorrect. 'rds:CreateDBInstance' is not required for Enhanced Monitoring; it is used for database creation, not monitoring.

  • ✗

    The policy does not include 'monitoring:ListMetrics'.

    Why it's wrong here

    Incorrect. 'monitoring:ListMetrics' is not needed; Enhanced Monitoring uses CloudWatch Logs, and the required permissions are for log events, not metrics listing.

  • ✗

    The resource is set to '*' instead of the specific DB instance ARN.

    Why it's wrong here

    Incorrect. Using '*' as the resource does not prevent functionality as long as the trust policy is correctly configured.

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Last reviewed: Jun 20, 2026

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