Quick Answer
The correct answer is Amazon CloudWatch Events with a rule for the 'RootSignIn' event from CloudTrail. This works because CloudWatch Events can ingest and filter API calls logged by AWS CloudTrail, and the 'RootSignIn' event is a predefined, automatically generated event that fires specifically when the root user authenticates to the Management Console. By creating a rule that matches this event pattern, you can trigger an action such as an SNS notification or a Lambda function, providing immediate alerting without custom code. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of event-driven monitoring and the integration between CloudTrail and CloudWatch Events, often appearing as a straightforward question that distinguishes CloudWatch Events from services like Config or GuardDuty. A common trap is confusing this with a CloudTrail trail or metric filter, but remember: CloudTrail logs the action, and CloudWatch Events reacts to it. Memory tip: think "RootSignIn" as the event name that signals the root user has signed in, and CloudWatch Events is the rule engine that catches it.
This DOP-C02 practice question tests your understanding of monitoring and logging. 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 wants to be alerted when the root user signs in to the AWS Management Console. Which service should be used to create a monitoring rule for this event?
AWS Config
Why wrong: Config monitors resource configuration changes, not sign-in events.
Amazon S3
Why wrong: S3 is object storage, not a monitoring service.
AWS IAM
Why wrong: IAM manages access permissions, not event monitoring.
Amazon CloudWatch Events (now Events) with a rule for the 'RootSignIn' event from CloudTrail
CloudWatch Events can match the root sign-in event and send notifications.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Amazon CloudWatch Events (now Events) with a rule for the 'RootSignIn' event from CloudTrail
Amazon CloudWatch Events (now Events) can monitor AWS CloudTrail API calls and trigger actions based on specific events. The 'RootSignIn' event is a predefined CloudTrail event that fires when the root user signs in to the AWS Management Console. By creating a CloudWatch Events rule that matches this event, you can send notifications (e.g., via SNS) or invoke automated responses, meeting the alerting requirement.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
AWS Config
Why it's wrong here
Config monitors resource configuration changes, not sign-in events.
Amazon S3
Why it's wrong here
S3 is object storage, not a monitoring service.
AWS IAM
Why it's wrong here
IAM manages access permissions, not event monitoring.
Amazon CloudWatch Events (now Events) with a rule for the 'RootSignIn' event from CloudTrail
Why this is correct
CloudWatch Events can match the root sign-in event and send notifications.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates may confuse AWS Config (which can detect configuration changes but not real-time API call events) with CloudWatch Events, or mistakenly think IAM can generate alerts, when in fact only CloudWatch Events can create rules based on CloudTrail events like 'RootSignIn'.
Detailed technical explanation
CloudWatch Events uses event patterns to match CloudTrail log entries; the 'RootSignIn' event is generated when the root user authenticates via the AWS Management Console, and the event pattern includes the userIdentity type as 'Root'. Under the hood, CloudWatch Events evaluates incoming events against rules in near real-time, and you can configure targets such as SNS topics, Lambda functions, or SQS queues to trigger notifications or remediation actions. A subtle behavior is that the 'RootSignIn' event is only emitted for console sign-ins, not for programmatic access (e.g., CLI or SDK), so you must ensure CloudTrail is enabled and logging management events.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
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FAQ
Monitoring and Logging — This question tests Monitoring and Logging — Read the scenario before looking for a memorised answer..
The correct answer is: Amazon CloudWatch Events (now Events) with a rule for the 'RootSignIn' event from CloudTrail — Amazon CloudWatch Events (now Events) can monitor AWS CloudTrail API calls and trigger actions based on specific events. The 'RootSignIn' event is a predefined CloudTrail event that fires when the root user signs in to the AWS Management Console. By creating a CloudWatch Events rule that matches this event, you can send notifications (e.g., via SNS) or invoke automated responses, meeting the alerting requirement.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This DOP-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 DOP-C02 exam.
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