This DOP-C02 practice question tests your understanding of sdlc 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.
A DevOps engineer needs to automatically roll back a CodeDeploy deployment if the number of failed instances exceeds a threshold. Which deployment configuration should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set the minimum number of healthy instances in the deployment configuration to trigger automatic rollback.
Option B is correct because setting the minimum number of healthy instances in the deployment configuration directly controls when CodeDeploy triggers an automatic rollback. When the number of healthy instances falls below this threshold during a deployment, CodeDeploy automatically stops the deployment and rolls back to the last known good state, meeting the requirement to roll back based on failed instance count.
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.
✗
Configure the deployment group to ignore failed instances.
Why it's wrong here
Ignoring failures would not meet the requirement.
✓
Set the minimum number of healthy instances in the deployment configuration to trigger automatic rollback.
Why this is correct
CodeDeploy can automatically roll back based on health thresholds.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a CloudWatch alarm to trigger a rollback.
Why it's wrong here
CloudWatch alarms can trigger actions but not directly roll back CodeDeploy.
✗
Use a custom deployment configuration that fails the deployment if any instance fails.
Why it's wrong here
This would stop the deployment but not automatically roll back.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse a deployment failure with an automatic rollback, assuming that failing the deployment inherently reverts changes, but CodeDeploy requires explicit rollback configuration (via minimum healthy hosts or CloudWatch alarms) to actually revert to a previous revision.
Detailed technical explanation
How to think about this question
Under the hood, CodeDeploy uses the 'minimum healthy hosts' setting as a percentage or absolute count within the deployment configuration. During a deployment, CodeDeploy continuously evaluates the health of instances based on the configured health checks (e.g., ELB health checks or script-based validation). If the number of healthy instances drops below the threshold, CodeDeploy immediately initiates a rollback, which redeploys the last successful revision to the failed instances, ensuring minimal downtime in production environments.
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.
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: Set the minimum number of healthy instances in the deployment configuration to trigger automatic rollback. — Option B is correct because setting the minimum number of healthy instances in the deployment configuration directly controls when CodeDeploy triggers an automatic rollback. When the number of healthy instances falls below this threshold during a deployment, CodeDeploy automatically stops the deployment and rolls back to the last known good state, meeting the requirement to roll back based on failed instance count.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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