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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 configuration. After a deployment, the new instances are not registered with the load balancer, causing downtime. 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 IAM role for CodeDeploy does not have permission to register instances with the load balancer.
Why wrong: If permissions were missing, the deployment would fail with an error, not silently skip registration.
B
The original instances are still registered with the load balancer.
Why wrong: In blue/green, original instances are typically deregistered after new ones are healthy.
C
The load balancer health check is misconfigured.
Why wrong: The health check is used by ELB, but CodeDeploy uses its own lifecycle hooks.
D
The CodeDeploy deployment group does not have a load balancer configured or the deregistration delay is too long.
CodeDeploy needs a load balancer configured to register new instances; without it, instances may not be registered.

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 CodeDeploy deployment group does not have a load balancer configured or the deregistration delay is too long.

Option D is correct because if the CodeDeploy deployment group does not have a load balancer configured, CodeDeploy will not register new instances with any load balancer, causing them to remain out of service. Additionally, if the deregistration delay is too long, the old instances may not be deregistered in time, but the primary issue is the missing load balancer configuration in the deployment group, which prevents the new instances from being registered at all.

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 IAM role for CodeDeploy does not have permission to register instances with the load balancer.
Why it's wrong here
If permissions were missing, the deployment would fail with an error, not silently skip registration.
✗
The original instances are still registered with the load balancer.
Why it's wrong here
In blue/green, original instances are typically deregistered after new ones are healthy.
✗
The load balancer health check is misconfigured.
Why it's wrong here
The health check is used by ELB, but CodeDeploy uses its own lifecycle hooks.
✓
The CodeDeploy deployment group does not have a load balancer configured or the deregistration delay is too long.
Why this is correct
CodeDeploy needs a load balancer configured to register new instances; without it, instances may not be registered.
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.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often assume the issue is a permissions problem (Option A) or a health check misconfiguration (Option C), but the most likely cause is that the deployment group simply lacks a load balancer configuration, which is a common oversight in blue/green deployments.

Detailed technical explanation

How to think about this question

In AWS CodeDeploy blue/green deployments, the deployment group configuration includes an optional load balancer setting under 'Load balancer' section. If this is not specified, CodeDeploy will not automatically register new instances with any load balancer, leaving them unregistered and causing downtime. The deregistration delay is a separate setting that controls how long the load balancer waits before forcibly deregistering old instances, but it does not affect registration of new instances. A real-world scenario is when a user creates a deployment group without attaching a load balancer, assuming CodeDeploy will automatically detect and register instances with the existing ALB, which it does not.

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 CodeDeploy deployment group does not have a load balancer configured or the deregistration delay is too long. — Option D is correct because if the CodeDeploy deployment group does not have a load balancer configured, CodeDeploy will not register new instances with any load balancer, causing them to remain out of service. Additionally, if the deregistration delay is too long, the old instances may not be deregistered in time, but the primary issue is the missing load balancer configuration in the deployment group, which prevents the new instances from being registered at all.

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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