The answer is to investigate CloudWatch Synthetics canary logs for error messages, along with the canary’s execution time and memory usage metrics. This is correct because each canary script is constrained by a hard 5-minute (300-second) timeout and a 1 GB memory limit; when either threshold is exceeded, the canary fails with a timeout error, making these three aspects—logs, duration, and memory—the essential diagnostic triad. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of Synthetics resource boundaries and how to pinpoint intermittent failures, often hiding a trap where candidates focus only on network latency or endpoint health rather than the script’s own resource consumption. A quick memory tip: think “Logs, Time, RAM” to remember the three investigation points—logs reveal the error, time shows if the script is too slow, and RAM indicates if it’s too heavy.
DOP-C02 Monitoring and Logging Practice Question
This DOP-C02 practice question tests your understanding of monitoring and logging. 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.
A company uses Amazon CloudWatch Synthetics canaries to monitor endpoint availability. The canaries are failing intermittently with timeout errors. The DevOps team needs to diagnose the issue. Which THREE aspects should they investigate?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The canary script execution time and memory usage.
Option B is correct because canary scripts have a maximum execution time of 5 minutes (300 seconds) and a memory limit of 1 GB. If the script execution time or memory usage exceeds these limits, the canary will fail with a timeout error. Investigating these metrics in CloudWatch can reveal whether the script is too resource-intensive or slow, causing the intermittent 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 canary schedule and frequency.
Why it's wrong here
Schedule does not cause timeout errors.
✓
The canary script execution time and memory usage.
Why this is correct
Excessive execution time or memory can cause timeouts.
Related concept
Read the scenario before looking for a memorised answer.
✓
Network connectivity and routing from the canary's VPC to the target endpoint.
Why this is correct
Network issues can cause timeouts.
Related concept
Read the scenario before looking for a memorised answer.
✓
CloudWatch Synthetics canary logs for error messages.
Why this is correct
Logs provide detailed error information.
Related concept
Read the scenario before looking for a memorised answer.
✗
CloudWatch Logs retention policy for the canary logs.
Why it's wrong here
Retention policy affects storage, not timeout errors.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse canary schedule frequency with execution timeout, thinking that running the canary less often will fix timeout errors, when the root cause is actually script performance or network latency.
Detailed technical explanation
How to think about this question
CloudWatch Synthetics canaries run in a Lambda execution environment with a maximum timeout of 5 minutes and 1 GB memory. When a canary script exceeds these limits, Lambda terminates the execution and reports a timeout error. Under the hood, the canary uses Puppeteer or Playwright to perform browser actions, and if the page load time or script logic takes too long, the canary fails. Real-world scenarios include heavy page assets or inefficient script loops that push execution time beyond the limit.
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.
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: The canary script execution time and memory usage. — Option B is correct because canary scripts have a maximum execution time of 5 minutes (300 seconds) and a memory limit of 1 GB. If the script execution time or memory usage exceeds these limits, the canary will fail with a timeout error. Investigating these metrics in CloudWatch can reveal whether the script is too resource-intensive or slow, causing the intermittent failures.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A DevOps team is using Amazon CloudWatch Synthetics canaries to monitor the availability of a web application. The canary is configured to run every 5 minutes. The team notices that the canary fails occasionally but the application is healthy. Which action will help identify if the failures are due to network issues between the canary and the application?
hard
A.Enable VPC Flow Logs for the canary's VPC and analyze the logs for dropped packets
B.Enable AWS X-Ray tracing on the canary to trace the request path
C.Increase the canary's memory and timeout settings to reduce false positives
✓ D.Configure the canary to run inside the same VPC as the application using a VPC endpoint
Why D: Option C is correct because CloudWatch Synthetics canaries support the use of VPC endpoints or placement within a VPC to run from the same network environment as the application, allowing canary failures due to network issues to be distinguished from application issues. Option A is wrong because X-Ray traces the application, not the canary. Option B is wrong because VPC Flow Logs capture network metadata but are not directly integrated with canaries. Option D is wrong because enabling detailed CloudWatch metrics on the ALB does not isolate canary network issues.
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This DOP-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DOP-C02 exam.
Question Discussion
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