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Question 1,546 of 1,740

Incident and Event Response →hardMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is to use EC2Rescue for Windows Server or Linux, configure it to run at instance startup, and extend the Auto Scaling health check grace period. This works because EC2Rescue is purpose-built for capturing memory dumps and system logs from failing EC2 instances, and by running it at startup you collect diagnostics before the instance fails health checks and gets terminated. Extending the grace period gives EC2Rescue enough time to complete its data collection before Auto Scaling marks the instance unhealthy. On the DOP-C02 exam, this scenario tests your understanding of how to preserve forensic evidence from ephemeral instances in Auto Scaling groups—a common trap is trying to attach an IAM role after the instance is already failing, which is too late. Remember the memory tip: "Startup and Grace" — configure EC2Rescue to run at startup, then extend the grace period to buy time for the dump to complete.

DOP-C02 Incident and Event Response Practice Question

This DOP-C02 practice question tests your understanding of incident and event response. 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 DevOps engineer notices that an EC2 instance in an Auto Scaling group is repeatedly failing health checks and being terminated. The engineer needs to capture the root cause by collecting memory dumps and system logs before termination. What should the engineer do?

Question 1hardmultiple choice

Read the full NAT/PAT explanation →

A
Configure the CloudWatch Agent to collect memory and system logs and publish them to CloudWatch Logs.
Why wrong: CloudWatch Agent collects metrics and logs, but not memory dumps.
B
Use EC2Rescue for Windows Server or Linux, configure it to run at instance startup, and extend the Auto Scaling health check grace period.
EC2Rescue can run diagnostics at startup; extending the grace period gives time for the tool to collect data before termination.
C
Use AWS Systems Manager Run Command to execute a script on the instance that collects diagnostics before it is terminated.
Why wrong: Run Command requires the instance to be running and communicating; the instance may fail before the command executes.
D
Enable EC2 instance metadata service (IMDS) to capture diagnostic data that persists after termination.
Why wrong: Instance metadata is lost when the instance is terminated.

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

✓

Use EC2Rescue for Windows Server or Linux, configure it to run at instance startup, and extend the Auto Scaling health check grace period.

Option B is correct because EC2Rescue is specifically designed to collect memory dumps and system logs from EC2 instances, and by configuring it to run at startup and extending the Auto Scaling health check grace period, the engineer ensures diagnostics are captured before the instance is terminated for failing health checks. This approach directly addresses the need to gather root cause data from a failing instance that is about to be replaced.

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.

✗
Configure the CloudWatch Agent to collect memory and system logs and publish them to CloudWatch Logs.
Why it's wrong here
CloudWatch Agent collects metrics and logs, but not memory dumps.
✓
Use EC2Rescue for Windows Server or Linux, configure it to run at instance startup, and extend the Auto Scaling health check grace period.
Why this is correct
EC2Rescue can run diagnostics at startup; extending the grace period gives time for the tool to collect data before termination.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use AWS Systems Manager Run Command to execute a script on the instance that collects diagnostics before it is terminated.
Why it's wrong here
Run Command requires the instance to be running and communicating; the instance may fail before the command executes.
✗
Enable EC2 instance metadata service (IMDS) to capture diagnostic data that persists after termination.
Why it's wrong here
Instance metadata is lost when the instance is terminated.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often assume Systems Manager Run Command (Option C) can reliably execute scripts on failing instances, but they overlook that the instance must be in a running and reachable state, which is not guaranteed when health checks are repeatedly failing and termination is imminent.

Trap categories for this question

Command / output trap
Run Command requires the instance to be running and communicating; the instance may fail before the command executes.

Detailed technical explanation

How to think about this question

EC2Rescue for Windows Server or Linux is a tool that automates the collection of operating system-level diagnostics, including memory dumps (e.g., from kernel panics or blue screens) and system logs (e.g., /var/log/messages). When configured to run at instance startup via user data or Systems Manager, it can output diagnostics to a specified location (e.g., S3) before the instance is terminated. Extending the Auto Scaling health check grace period gives the instance more time to complete the diagnostic collection before it is marked unhealthy and terminated, which is critical because the default grace period (300 seconds) may be insufficient for the tool to run and upload data.

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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

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 DOP-C02 question test?

Incident and Event Response — This question tests Incident and Event Response — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Use EC2Rescue for Windows Server or Linux, configure it to run at instance startup, and extend the Auto Scaling health check grace period. — Option B is correct because EC2Rescue is specifically designed to collect memory dumps and system logs from EC2 instances, and by configuring it to run at startup and extending the Auto Scaling health check grace period, the engineer ensures diagnostics are captured before the instance is terminated for failing health checks. This approach directly addresses the need to gather root cause data from a failing instance that is about to be replaced.

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

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →

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Same concept, more angles

1 more ways this is tested on DOP-C02

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A company experiences an EC2 instance failure in an Auto Scaling group. The instance is terminated and replaced automatically. The DevOps engineer needs to troubleshoot why the instance failed. Which AWS service should the engineer use to view the instance's console output and screenshots before termination?

medium

A.AWS CloudTrail
B.Amazon CloudWatch Logs
✓ C.AWS Systems Manager Session Manager
D.AWS Config

Why C: Option B is correct because AWS Systems Manager Session Manager can be used to retrieve EC2 console output and screenshots. Option A (CloudWatch Logs) does not capture console output by default. Option C (CloudTrail) records API calls, not instance-level console output. Option D (Config) is for configuration compliance, not troubleshooting instance failures.

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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.