- A
Use AWS CloudTrail to log Lambda invocations and configure CloudWatch alarms on the log events.
Why wrong: CloudTrail logs API calls, not function execution metrics.
- B
Enable Lambda Insights to collect detailed metrics and use CloudWatch dashboards to monitor error rates.
Why wrong: Lambda Insights is overkill for simple metric monitoring.
- C
Stream Lambda logs to CloudWatch Logs and use CloudWatch Logs Insights to query error rates, then create alarms.
Why wrong: Metrics are already available; no need to query logs.
- D
Use CloudWatch metrics published by Lambda and create a CloudWatch alarm on the ErrorCount metric with a math expression to calculate error rate.
Lambda emits metrics automatically; alarms can be set directly.
Question 217 of 1,750
DOP-C02 Monitoring and Logging Practice Question
This DOP-C02 practice question tests your understanding of monitoring and logging. 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 is using AWS Lambda functions for data processing. The operations team needs to monitor the number of invocations, duration, and error counts for each function. They also want to set alarms when the error rate exceeds 5% in a 5-minute period. Which combination of AWS services should the team use to achieve this with minimal effort?
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
✓
Use CloudWatch metrics published by Lambda and create a CloudWatch alarm on the ErrorCount metric with a math expression to calculate error rate.
Option D is correct because Lambda automatically publishes invocations, duration, and error metrics to CloudWatch. You can create a CloudWatch alarm with a math expression that divides the ErrorCount by the Invocations metric to calculate the error rate, then set a threshold of 5% over a 5-minute period. This requires minimal effort as the metrics are built-in. Option A is incorrect because CloudTrail logs API calls to Lambda, not function execution metrics. Option B is incorrect because Lambda Insights is an optional feature for detailed performance monitoring, but it is not required for basic metrics and alarms. Option C is incorrect because while Lambda logs are sent to CloudWatch Logs, using Logs Insights to query error rates is more complex than using the pre-existing CloudWatch metrics; moreover, creating alarms on log events requires additional configuration and is not as straightforward as using metric math on the standard ErrorCount 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.
- ✗
Use AWS CloudTrail to log Lambda invocations and configure CloudWatch alarms on the log events.
Why it's wrong here
CloudTrail logs API calls, not function execution metrics.
- ✗
Enable Lambda Insights to collect detailed metrics and use CloudWatch dashboards to monitor error rates.
Why it's wrong here
Lambda Insights is overkill for simple metric monitoring.
- ✗
Stream Lambda logs to CloudWatch Logs and use CloudWatch Logs Insights to query error rates, then create alarms.
Why it's wrong here
Metrics are already available; no need to query logs.
- ✓
Use CloudWatch metrics published by Lambda and create a CloudWatch alarm on the ErrorCount metric with a math expression to calculate error rate.
Why this is correct
Lambda emits metrics automatically; alarms can be set directly.
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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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Monitoring and Logging — This question tests Monitoring and Logging — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use CloudWatch metrics published by Lambda and create a CloudWatch alarm on the ErrorCount metric with a math expression to calculate error rate. — Option D is correct because Lambda automatically publishes invocations, duration, and error metrics to CloudWatch. You can create a CloudWatch alarm with a math expression that divides the ErrorCount by the Invocations metric to calculate the error rate, then set a threshold of 5% over a 5-minute period. This requires minimal effort as the metrics are built-in. Option A is incorrect because CloudTrail logs API calls to Lambda, not function execution metrics. Option B is incorrect because Lambda Insights is an optional feature for detailed performance monitoring, but it is not required for basic metrics and alarms. Option C is incorrect because while Lambda logs are sent to CloudWatch Logs, using Logs Insights to query error rates is more complex than using the pre-existing CloudWatch metrics; moreover, creating alarms on log events requires additional configuration and is not as straightforward as using metric math on the standard ErrorCount 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.
About these practice questions
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Last reviewed: Jun 20, 2026
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