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SDLC Automation →mediumMultiple 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.

A company uses AWS CodeDeploy with a blue/green deployment strategy for an Amazon EC2 Auto Scaling group. During deployment, the new instances are failing health checks and the deployment is rolling back. 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 new instances are not passing the configured health check grace period.
If health checks fail during the grace period, CodeDeploy rolls back.
B
The application is not registered with an Elastic Load Balancer.
Why wrong: Blue/green deployments do not require an ELB; they can use an ASG.
C
The deployment group is not configured to use an Auto Scaling group.
Why wrong: The question states it uses an ASG.
D
The CodeDeploy agent is not installed on the new instances.
Why wrong: If the agent were missing, the deployment would fail before health checks.

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 new instances are not passing the configured health check grace period.

In a blue/green deployment with CodeDeploy, new instances are launched and must pass health checks before traffic is routed to them. If the health check grace period is not configured or is too short, the new instances may be deemed unhealthy before the application has fully started, triggering a rollback. This is the most likely cause because the health check grace period directly controls how long CodeDeploy waits before evaluating instance health.

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 new instances are not passing the configured health check grace period.
Why this is correct
If health checks fail during the grace period, CodeDeploy rolls back.
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 application is not registered with an Elastic Load Balancer.
Why it's wrong here
Blue/green deployments do not require an ELB; they can use an ASG.
✗
The deployment group is not configured to use an Auto Scaling group.
Why it's wrong here
The question states it uses an ASG.
✗
The CodeDeploy agent is not installed on the new instances.
Why it's wrong here
If the agent were missing, the deployment would fail before health checks.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often assume the CodeDeploy agent is missing (Option D) because it's a common issue, but the agent must be present for the deployment to even start—health check failures occur after the agent has successfully installed the application.

Detailed technical explanation

How to think about this question

The health check grace period in CodeDeploy is defined in the deployment group configuration and defaults to 0 seconds, meaning health checks begin immediately. For applications that take time to initialize (e.g., booting a web server), a grace period of 60-300 seconds is common. Under the hood, CodeDeploy uses the Elastic Load Balancer's health check settings (e.g., ping path, interval, threshold) to determine instance health; if the grace period expires before the application is ready, the instance is marked unhealthy and the deployment rolls back.

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?

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 new instances are not passing the configured health check grace period. — In a blue/green deployment with CodeDeploy, new instances are launched and must pass health checks before traffic is routed to them. If the health check grace period is not configured or is too short, the new instances may be deemed unhealthy before the application has fully started, triggering a rollback. This is the most likely cause because the health check grace period directly controls how long CodeDeploy waits before evaluating instance health.

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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