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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.

A company runs a critical application on Amazon EC2 instances managed by an Auto Scaling group behind an Application Load Balancer. They use AWS CodeDeploy for blue/green deployments. The deployment process creates a new Auto Scaling group (green) and routes traffic to it after a successful deployment. Recently, the deployment succeeded but the green instances are not receiving traffic; users are still served by the old (blue) instances. The deployment logs show that the 'AllowTraffic' step succeeded. The team checked the ALB target groups; the green target group has healthy instances but the ALB listener default action still points to the blue target group. What is the most likely cause and remediation?

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 ALB has sticky sessions enabled, causing traffic to stick to the blue instances. Disable sticky sessions.
Why wrong: Incorrect: Stickiness would still allow new sessions to go to green if routing is correct.
B
The deployment configuration uses 'AllAtOnce' traffic shifting, which is not supported for blue/green with an ALB. Change to 'Canary' or 'Linear'.
Why wrong: Incorrect: AllAtOnce is supported for blue/green with ALB.
C
The deregistration delay on the blue target group is too long, preventing traffic from shifting. Reduce the deregistration delay to 0 seconds.
Why wrong: Incorrect: Deregistration delay affects draining, not initial routing.
D
The CodeDeploy deployment group is not configured to update the ALB listener rule. Update the deployment group to include the ALB listener ARN so that CodeDeploy can switch the listener to the green target group.
Correct: CodeDeploy must be configured with the listener ARN to update routing.

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 is not configured to update the ALB listener rule. Update the deployment group to include the ALB listener ARN so that CodeDeploy can switch the listener to the green target group.

Option D is correct because in a CodeDeploy blue/green deployment with an ALB, the deployment group must be configured with the ALB listener ARN to allow CodeDeploy to update the listener rule to point to the green target group. Without this configuration, the listener remains pointing to the blue target group, even if the 'AllowTraffic' step completes. Option A is incorrect because sticky sessions would not prevent the listener from being updated; they only affect session persistence. Option B is incorrect because deregistration delay affects how long it takes to drain connections from the old instances, but the listener rule update is independent. Option C is incorrect because 'AllAtOnce' traffic shifting is supported; the issue is the missing listener configuration.

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 ALB has sticky sessions enabled, causing traffic to stick to the blue instances. Disable sticky sessions.
Why it's wrong here
Incorrect: Stickiness would still allow new sessions to go to green if routing is correct.
✗
The deployment configuration uses 'AllAtOnce' traffic shifting, which is not supported for blue/green with an ALB. Change to 'Canary' or 'Linear'.
Why it's wrong here
Incorrect: AllAtOnce is supported for blue/green with ALB.
✗
The deregistration delay on the blue target group is too long, preventing traffic from shifting. Reduce the deregistration delay to 0 seconds.
Why it's wrong here
Incorrect: Deregistration delay affects draining, not initial routing.
✓
The CodeDeploy deployment group is not configured to update the ALB listener rule. Update the deployment group to include the ALB listener ARN so that CodeDeploy can switch the listener to the green target group.
Why this is correct
Correct: CodeDeploy must be configured with the listener ARN to update routing.
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

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?

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 is not configured to update the ALB listener rule. Update the deployment group to include the ALB listener ARN so that CodeDeploy can switch the listener to the green target group. — Option D is correct because in a CodeDeploy blue/green deployment with an ALB, the deployment group must be configured with the ALB listener ARN to allow CodeDeploy to update the listener rule to point to the green target group. Without this configuration, the listener remains pointing to the blue target group, even if the 'AllowTraffic' step completes. Option A is incorrect because sticky sessions would not prevent the listener from being updated; they only affect session persistence. Option B is incorrect because deregistration delay affects how long it takes to drain connections from the old instances, but the listener rule update is independent. Option C is incorrect because 'AllAtOnce' traffic shifting is supported; the issue is the missing listener configuration.

What should I do if I get this DOP-C02 question wrong?

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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