← DOP-C02·Amazon Web Services

Question 216 of 1,750

Monitoring and Logging →mediumMultiple ChoiceObjective-mapped

Notification for EC2 Instance Launch Using EventBridge

This DOP-C02 practice question tests your understanding of monitoring and logging. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.

Exhibit

CloudTrail log entry:
{
  "eventVersion": "1.08",
  "userIdentity": {
    "type": "IAMUser",
    "arn": "arn:aws:iam::123456789012:user/JohnDoe",
    "accountId": "123456789012",
    "userName": "JohnDoe"
  },
  "eventTime": "2024-06-01T12:00:00Z",
  "eventSource": "ec2.amazonaws.com",
  "eventName": "RunInstances",
  "awsRegion": "us-east-1",
  "sourceIPAddress": "203.0.113.50",
  "userAgent": "console.amazonaws.com",
  "requestParameters": {
    "instanceType": "t2.micro",
    "imageId": "ami-0abcdef1234567890",
    "maxCount": 1,
    "minCount": 1
  },
  "responseElements": {
    "instancesSet": {
      "items": [
        {
          "instanceId": "i-0abcd1234efgh5678",
          "instanceState": {
            "code": 0,
            "name": "pending"
          }
        }
      ]
    }
  }
}

Refer to the exhibit. An administrator wants to be notified when any EC2 instance is launched in the account. Which combination of services would provide the most efficient and cost-effective solution?

Exhibit

CloudTrail log entry:
{
  "eventVersion": "1.08",
  "userIdentity": {
    "type": "IAMUser",
    "arn": "arn:aws:iam::123456789012:user/JohnDoe",
    "accountId": "123456789012",
    "userName": "JohnDoe"
  },
  "eventTime": "2024-06-01T12:00:00Z",
  "eventSource": "ec2.amazonaws.com",
  "eventName": "RunInstances",
  "awsRegion": "us-east-1",
  "sourceIPAddress": "203.0.113.50",
  "userAgent": "console.amazonaws.com",
  "requestParameters": {
    "instanceType": "t2.micro",
    "imageId": "ami-0abcdef1234567890",
    "maxCount": 1,
    "minCount": 1
  },
  "responseElements": {
    "instancesSet": {
      "items": [
        {
          "instanceId": "i-0abcd1234efgh5678",
          "instanceState": {
            "code": 0,
            "name": "pending"
          }
        }
      ]
    }
  }
}

A
Enable detailed billing reports and create a cost anomaly detection monitor.
Why wrong: This would detect cost changes, not specific instance launches in real-time.
B
Use AWS Config rules to detect non-compliant instances and trigger an SNS notification.
Why wrong: Config rules are for compliance, not real-time event notification. They have a delay and are not designed for every instance launch.
C
Create an Amazon EventBridge rule that matches RunInstances events from CloudTrail and sends to an SNS topic.
EventBridge can capture CloudTrail events in real-time and trigger actions like SNS notifications.
D
Set up a CloudWatch alarm on the RunInstances metric in the EC2 namespace.
Why wrong: There is no RunInstances metric in EC2; metrics are for utilization, not API calls.

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

✓

Create an Amazon EventBridge rule that matches RunInstances events from CloudTrail and sends to an SNS topic.

CloudTrail logs all API calls. By creating a CloudWatch Events rule (now Amazon EventBridge) that matches the RunInstances event, you can trigger a Lambda function or send to SNS. This is efficient and cost-effective.

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.

✗
Enable detailed billing reports and create a cost anomaly detection monitor.
Why it's wrong here
This would detect cost changes, not specific instance launches in real-time.
✗
Use AWS Config rules to detect non-compliant instances and trigger an SNS notification.
Why it's wrong here
Config rules are for compliance, not real-time event notification. They have a delay and are not designed for every instance launch.
✓
Create an Amazon EventBridge rule that matches RunInstances events from CloudTrail and sends to an SNS topic.
Why this is correct
EventBridge can capture CloudTrail events in real-time and trigger actions like SNS notifications.
Related concept
Read the scenario before looking for a memorised answer.
✗
Set up a CloudWatch alarm on the RunInstances metric in the EC2 namespace.
Why it's wrong here
There is no RunInstances metric in EC2; metrics are for utilization, not API calls.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.

Quick reference

Cloud Service Model Comparison

Model	You Manage	Provider Manages	Examples
IaaS	OS, runtime, apps, data	Hardware, hypervisor, networking	EC2, Azure VMs, GCP Compute Engine
PaaS	Apps and data	OS, runtime, middleware, hardware	Elastic Beanstalk, Azure App Service
SaaS	Data and settings only	Everything else	Microsoft 365, Salesforce, Workday
FaaS / Serverless	Function code only	Infra, scaling, runtime	Lambda, Azure Functions, Cloud Run
CaaS	Containers and apps	Kubernetes, OS, hardware	EKS, AKS, GKE

What to study next

Got this wrong? Here's your next step.

Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

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

What is the correct answer to this question?

The correct answer is: Create an Amazon EventBridge rule that matches RunInstances events from CloudTrail and sends to an SNS topic. — CloudTrail logs all API calls. By creating a CloudWatch Events rule (now Amazon EventBridge) that matches the RunInstances event, you can trigger a Lambda function or send to SNS. This is efficient and cost-effective.

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

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

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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.

Notification for EC2 Instance Launch Using EventBridge

Exhibit

Exhibit

Why each option matters

Option-by-option breakdown

Common exam trap: answer the scenario, not the keyword

How to think about this question

KKey Concepts to Remember

TExam Day Tips

How this comes up in practice

Cloud Service Model Comparison

Got this wrong? Here's your next step.

Related DOP-C02 practice-question pages

Configuration Management and IaC practice questions

Resilient Cloud Solutions practice questions

Monitoring and Logging practice questions

Incident and Event Response practice questions

Security and Compliance practice questions

SDLC Automation practice questions

DOP-C02 fundamentals practice questions

DOP-C02 scenario practice questions

DOP-C02 troubleshooting practice questions

Start a free DOP-C02 practice session

Questions learners often ask

What does this DOP-C02 question test?

What is the correct answer to this question?

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

What is the key concept behind this question?

More DOP-C02 practice questions

Question Discussion