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.
Exhibit
CodePipeline execution history:
Pipeline: MyPipeline
Date: 2024-03-01
Stage: Deploy
Action: DeployToECS
Execution ID: e-123456789
Status: Succeeded
Revision: commit SHA abc123
Deployment details:
- ECS service: my-service
- Task definition: my-task:12
- Desired count: 2
- Running count: 2
- Pending count: 0
After deployment, application health checks fail. Rolling back to previous revision (task definition my-task:11) resolves the issue.
CloudWatch Logs from ECS tasks:
[ERROR] Failed to connect to database: TimeoutError: connect ETIMEDOUT 10.0.0.5:5432
Refer to the exhibit. The deployment succeeded but the application fails. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The new task definition has a misconfigured database connection string or security group.
The error shows a database connection timeout to an internal IP (10.0.0.5). The new task definition likely has incorrect environment variables or security group rules that prevent connecting to the database.
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 CodePipeline deployment action uses the wrong cluster.
Why it's wrong here
The deployment succeeded and tasks are running, so cluster is correct.
✓
The new task definition has a misconfigured database connection string or security group.
Why this is correct
The timeout to database IP indicates network or configuration issue introduced by the new task definition.
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 ECS service is not registered with a target group.
Why it's wrong here
The deployment succeeded, so ALB routing is likely fine.
✗
The database is not available in the same Availability Zone.
Why it's wrong here
The error is timeout, not connectivity, and AZ mismatch would not cause timeout.
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
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 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.
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 new task definition has a misconfigured database connection string or security group. — The error shows a database connection timeout to an internal IP (10.0.0.5). The new task definition likely has incorrect environment variables or security group rules that prevent connecting to the database.
What should I do if I get this DOP-C02 question wrong?
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.
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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Question Discussion
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