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Question 880 of 1,546

Deployment, Provisioning, and Automation →hardMultiple ChoiceObjective-mapped

SOA-C02 Deployment, Provisioning, and Automation Practice Question

This SOA-C02 practice question tests your understanding of deployment, provisioning, and automation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 is using AWS CodeDeploy with a blue/green deployment configuration for an EC2/On-Premises compute platform. During a deployment, the new instances pass all health checks, but the old instances are not terminated after the deployment completes. 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 Auto Scaling group has a cooldown period that prevents termination.
Why wrong: Cooldown affects scaling, not CodeDeploy termination.
B
The new instances failed the initial health check.
Why wrong: The question states they passed health checks.
C
The deployment configuration specifies 'Reroute traffic to new instances and keep old instances running' with no termination.
Blue/green deployments can be configured to not terminate old instances automatically.
D
The deployment was rolled back automatically.
Why wrong: Rollback would revert to old instances, but they would still be running.

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 configuration specifies 'Reroute traffic to new instances and keep old instances running' with no termination.

In AWS CodeDeploy blue/green deployments for the EC2/On-Premises compute platform, the deployment configuration determines the lifecycle of the original (old) instances. Option C is correct because the deployment configuration explicitly specifies 'Reroute traffic to new instances and keep old instances running' with no termination, which instructs CodeDeploy to leave the old instances running after traffic is rerouted. This behavior is controlled by the deployment group's configuration, not by Auto Scaling or health check failures.

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 Auto Scaling group has a cooldown period that prevents termination.
Why it's wrong here
Cooldown affects scaling, not CodeDeploy termination.
✗
The new instances failed the initial health check.
Why it's wrong here
The question states they passed health checks.
✓
The deployment configuration specifies 'Reroute traffic to new instances and keep old instances running' with no termination.
Why this is correct
Blue/green deployments can be configured to not terminate old instances automatically.
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 deployment was rolled back automatically.
Why it's wrong here
Rollback would revert to old instances, but they would still be running.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates assume old instances are always terminated after a successful blue/green deployment, overlooking the deployment configuration option that explicitly allows keeping old instances running with no termination.

Detailed technical explanation

How to think about this question

Under the hood, CodeDeploy blue/green deployments use a deployment configuration that includes a 'termination behavior' setting. When set to 'keep old instances running', CodeDeploy does not invoke the termination lifecycle hook or call the Auto Scaling group's detach/terminate actions; instead, it simply reroutes traffic from the load balancer to the new instances. This is useful for canary testing or manual validation before cleanup, but it can lead to unexpected costs if left unattended. The behavior is defined in the deployment group's 'blueGreenDeploymentConfiguration' parameter under 'terminationWaitTimeInMinutes' and 'actionOnTermination'.

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

An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.

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 SOA-C02 question test?

Deployment, Provisioning, and Automation — This question tests Deployment, Provisioning, and Automation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The deployment configuration specifies 'Reroute traffic to new instances and keep old instances running' with no termination. — In AWS CodeDeploy blue/green deployments for the EC2/On-Premises compute platform, the deployment configuration determines the lifecycle of the original (old) instances. Option C is correct because the deployment configuration explicitly specifies 'Reroute traffic to new instances and keep old instances running' with no termination, which instructs CodeDeploy to leave the old instances running after traffic is rerouted. This behavior is controlled by the deployment group's configuration, not by Auto Scaling or health check failures.

What should I do if I get this SOA-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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