- A
Create a CloudWatch Logs log group for the error metric.
Why wrong: Log group already exists.
- B
Create a metric filter on the log group to count occurrences of the error pattern.
This creates a custom metric for error count.
- C
Create a CloudWatch Logs subscription filter to stream errors to a Lambda function that calculates the error rate.
Why wrong: More complex than needed; metric filter and alarm suffice.
- D
Create a CloudWatch metric for the error count.
Why wrong: Metric filter creates the metric automatically.
- E
Create a CloudWatch alarm that uses a math expression to calculate the error rate (error count / total request count) and compare it to the threshold of 5%.
Math expressions allow calculation of rates.
Question 1,701 of 1,750
DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. 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 company runs a critical application on Amazon EC2 instances in an Auto Scaling group. The application generates logs that are sent to Amazon CloudWatch Logs. The DevOps team needs to configure a metric filter to monitor for error patterns and trigger an alarm when the error rate exceeds 5% of total requests over a 5-minute period. Which TWO steps should the team take? (Choose TWO.)
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
✓
Create a metric filter on the log group to count occurrences of the error pattern.
To achieve the monitoring goal, the team must first create a metric filter on the existing log group (Option B). This filter defines the error pattern to count and emits a custom metric for the error count. Then, they need to create a CloudWatch alarm that uses a math expression to calculate the error rate by dividing the error count metric by a total request count metric (or by using the same log group with another filter for total requests) and triggers when the rate exceeds 5% over 5 minutes (Option E). Option A is not required because the log group already exists. Option C is incorrect because a subscription filter would forward logs to Lambda, but the requirement is to use metric filters and alarms. Option D is incorrect because the metric is automatically created by the metric filter; you do not need to manually create a separate metric.
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.
- ✗
Create a CloudWatch Logs log group for the error metric.
Why it's wrong here
Log group already exists.
- ✓
Create a metric filter on the log group to count occurrences of the error pattern.
Why this is correct
This creates a custom metric for error count.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a CloudWatch Logs subscription filter to stream errors to a Lambda function that calculates the error rate.
Why it's wrong here
More complex than needed; metric filter and alarm suffice.
- ✗
Create a CloudWatch metric for the error count.
Why it's wrong here
Metric filter creates the metric automatically.
- ✓
Create a CloudWatch alarm that uses a math expression to calculate the error rate (error count / total request count) and compare it to the threshold of 5%.
Why this is correct
Math expressions allow calculation of rates.
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.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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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Resilient Cloud Solutions — study guide chapter
Learn the concepts, then practise the questions
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Resilient Cloud Solutions practice questions
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a metric filter on the log group to count occurrences of the error pattern. — To achieve the monitoring goal, the team must first create a metric filter on the existing log group (Option B). This filter defines the error pattern to count and emits a custom metric for the error count. Then, they need to create a CloudWatch alarm that uses a math expression to calculate the error rate by dividing the error count metric by a total request count metric (or by using the same log group with another filter for total requests) and triggers when the rate exceeds 5% over 5 minutes (Option E). Option A is not required because the log group already exists. Option C is incorrect because a subscription filter would forward logs to Lambda, but the requirement is to use metric filters and alarms. Option D is incorrect because the metric is automatically created by the metric filter; you do not need to manually create a separate metric.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
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