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Resilient Cloud Solutions →mediumMultiple ChoiceObjective-mapped

DOP-C02 Resilient Cloud Solutions Practice Question

This DOP-C02 practice question tests your understanding of resilient cloud solutions. 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.

A company runs a high-traffic e-commerce application on EC2 instances in an Auto Scaling group behind an ALB. The application uses an in-memory cache on the EC2 instances. During a recent deployment, the Auto Scaling group terminated an instance that had active user sessions, causing users to lose their cart data and leading to a poor customer experience. The company wants to prevent this in future deployments. They need a solution that allows existing sessions to complete before instance termination, without manual intervention. Which solution should they use?

A
Increase the Auto Scaling group's cooldown period and health check grace period.
Why wrong: Cooldown affects scaling activities, not instance termination behavior.
B
Enable connection draining on the ALB target group and increase the deregistration delay.
Why wrong: Connection draining only affects new connections; it does not wait for application-level session completion.
C
Implement an Auto Scaling lifecycle hook that puts the instance in a 'terminating:wait' state, and have a script on the instance that signals completion after draining sessions.
Lifecycle hooks enable custom actions before termination, allowing session draining.
D
Change the health check type to ELB and mark instances unhealthy before deployment.
Why wrong: Marking instances unhealthy would cause immediate termination without draining.

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

✓

Implement an Auto Scaling lifecycle hook that puts the instance in a 'terminating:wait' state, and have a script on the instance that signals completion after draining sessions.

Option C is correct because lifecycle hooks allow the Auto Scaling group to wait for a specified timeout before terminating an instance, giving the application time to drain sessions. Option A is incorrect because connection draining on the ALB only handles HTTP connections, not application-level session state. Option B is incorrect because increasing cooldown does not delay termination. Option D is incorrect because updating the health check type does not prevent immediate termination.

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.

✗
Increase the Auto Scaling group's cooldown period and health check grace period.
Why it's wrong here
Cooldown affects scaling activities, not instance termination behavior.
✗
Enable connection draining on the ALB target group and increase the deregistration delay.
Why it's wrong here
Connection draining only affects new connections; it does not wait for application-level session completion.
✓
Implement an Auto Scaling lifecycle hook that puts the instance in a 'terminating:wait' state, and have a script on the instance that signals completion after draining sessions.
Why this is correct
Lifecycle hooks enable custom actions before termination, allowing session draining.
Related concept
Read the scenario before looking for a memorised answer.
✗
Change the health check type to ELB and mark instances unhealthy before deployment.
Why it's wrong here
Marking instances unhealthy would cause immediate termination without draining.

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 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 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?

Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Implement an Auto Scaling lifecycle hook that puts the instance in a 'terminating:wait' state, and have a script on the instance that signals completion after draining sessions. — Option C is correct because lifecycle hooks allow the Auto Scaling group to wait for a specified timeout before terminating an instance, giving the application time to drain sessions. Option A is incorrect because connection draining on the ALB only handles HTTP connections, not application-level session state. Option B is incorrect because increasing cooldown does not delay termination. Option D is incorrect because updating the health check type does not prevent immediate termination.

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.

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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.