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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 CodePipeline to deploy a web application to Amazon EC2 instances behind an Application Load Balancer. The deployment uses a CodeDeploy action with an in-place deployment configuration. After a recent deployment, some instances are running the old version while others are running the new version. 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 deployment group is associated with an Auto Scaling group that launched new instances during the deployment.
Why wrong: New instances would be part of the deployment, not cause inconsistency.
B
The deployment group was configured with the 'AllAtOnce' deployment configuration, and the deployment failed partway through.
AllAtOnce deploys to all instances simultaneously; a failure may leave some instances updated.
C
A lifecycle hook is configured to pause the deployment until manual approval.
Why wrong: Manual approval pauses the entire deployment, not partial.
D
The deployment was configured to use a blue/green strategy, but the target group is misconfigured.
Why wrong: Blue/green would replace all instances, not leave old ones.

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 deployment group was configured with the 'AllAtOnce' deployment configuration, and the deployment failed partway through.

B is correct because the 'AllAtOnce' deployment configuration instructs CodeDeploy to deploy to all instances simultaneously. If the deployment fails partway through, some instances may have received the new version while others remain on the old version, resulting in a mixed state. This is the most likely cause given the symptom of a split between old and new versions across 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 deployment group is associated with an Auto Scaling group that launched new instances during the deployment.
Why it's wrong here
New instances would be part of the deployment, not cause inconsistency.
✓
The deployment group was configured with the 'AllAtOnce' deployment configuration, and the deployment failed partway through.
Why this is correct
AllAtOnce deploys to all instances simultaneously; a failure may leave some instances updated.
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.
✗
A lifecycle hook is configured to pause the deployment until manual approval.
Why it's wrong here
Manual approval pauses the entire deployment, not partial.
✗
The deployment was configured to use a blue/green strategy, but the target group is misconfigured.
Why it's wrong here
Blue/green would replace all instances, not leave old ones.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often assume a failed deployment would affect all instances equally, but they overlook that 'AllAtOnce' can leave a mixed state because CodeDeploy does not roll back instances that already received the new version when the deployment fails partway through.

Detailed technical explanation

How to think about this question

CodeDeploy's 'AllAtOnce' configuration deploys to all instances in the deployment group concurrently, with no rolling or canary phases. If the deployment fails mid-process (e.g., due to a failing script or resource constraint), CodeDeploy does not automatically roll back completed instances, leaving them with the new version while unprocessed instances retain the old version. This contrasts with 'HalfAtATime' or 'OneAtATime' configurations, which minimize such mixed states by controlling the batch size and allowing automatic rollback on failure.

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 deployment group was configured with the 'AllAtOnce' deployment configuration, and the deployment failed partway through. — B is correct because the 'AllAtOnce' deployment configuration instructs CodeDeploy to deploy to all instances simultaneously. If the deployment fails partway through, some instances may have received the new version while others remain on the old version, resulting in a mixed state. This is the most likely cause given the symptom of a split between old and new versions across 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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