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Question 970 of 1,750

SDLC Automation →hardMultiple ChoiceObjective-mapped

DOP-C02 SDLC Automation Practice Question

This DOP-C02 practice question tests your understanding of sdlc automation. 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.

An organization uses AWS CodeDeploy to deploy a web application to an Auto Scaling group. The deployment fails with the error 'The overall deployment failed because too many individual instances failed deployment, too few healthy instances are available for deployment, or some instances in your deployment group are experiencing problems.' The engineer reviews the deployment logs and finds that the AppSpec file is correctly formatted and the scripts run successfully on some instances. What is the MOST likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The CodeDeploy agent is not installed on some instances.
Why wrong: This would cause failures on those instances, consistent across deployments.
B
The target group is not configured to route traffic to the instances.
Why wrong: This would not cause instance deployment failures.
C
The health check grace period for the Auto Scaling group is too short.
Instances may be terminated before the application starts, causing deployment failure.
D
The IAM role assigned to the EC2 instances does not have sufficient permissions.
Why wrong: This would cause consistent failures on all instances.

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

✓

The health check grace period for the Auto Scaling group is too short.

The error indicates that instances are failing the deployment health check after the AppSpec scripts run successfully. When the health check grace period for the Auto Scaling group is too short, instances may be marked unhealthy before the application has fully started and passed the target group health checks, causing CodeDeploy to consider them failed. This is the most likely cause because the scripts succeed on some instances but the overall deployment fails due to insufficient healthy instances.

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.

✗
The CodeDeploy agent is not installed on some instances.
Why it's wrong here
This would cause failures on those instances, consistent across deployments.
✗
The target group is not configured to route traffic to the instances.
Why it's wrong here
This would not cause instance deployment failures.
✓
The health check grace period for the Auto Scaling group is too short.
Why this is correct
Instances may be terminated before the application starts, causing deployment failure.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The IAM role assigned to the EC2 instances does not have sufficient permissions.
Why it's wrong here
This would cause consistent failures on all instances.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse deployment script success with overall deployment health, not realizing that CodeDeploy relies on the target group's health checks (configured via the Auto Scaling group's health check grace period) to determine if an instance is healthy after deployment.

Detailed technical explanation

How to think about this question

The health check grace period in Auto Scaling groups (default 300 seconds) allows instances to boot and stabilize before ELB health checks begin. If this period is too short, the instance may be marked unhealthy before the application is ready, causing CodeDeploy to stop deployment to that instance and potentially roll back. Under the hood, CodeDeploy uses the target group's health check status to determine instance health; if the grace period expires before the application passes the health check, the instance is considered failed even if the deployment scripts completed successfully.

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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.

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?

SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The health check grace period for the Auto Scaling group is too short. — The error indicates that instances are failing the deployment health check after the AppSpec scripts run successfully. When the health check grace period for the Auto Scaling group is too short, instances may be marked unhealthy before the application has fully started and passed the target group health checks, causing CodeDeploy to consider them failed. This is the most likely cause because the scripts succeed on some instances but the overall deployment fails due to insufficient healthy instances.

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.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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