This DOP-C02 practice question tests your understanding of monitoring and logging. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 AWS X-Ray to trace requests through its microservices application. The DevOps engineer notices that some traces are incomplete. What is a possible reason?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The X-Ray SDK sampling rate is configured too low, causing many requests to be skipped.
Option C is correct because the X-Ray SDK uses a sampling rate to decide which requests to record. If the sampling rate is set too low, a large percentage of requests are skipped, leading to incomplete traces. The DevOps engineer would observe missing segments for requests that were not sampled, even though the daemon and SDK are functioning correctly.
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 X-Ray daemon is not running on the application servers.
Why it's wrong here
If SDK is used, daemon may not be needed; however, incomplete traces are more likely due to sampling.
✗
X-Ray cannot trace requests that cross multiple AWS services.
Why it's wrong here
X-Ray supports tracing across services with service maps.
✓
The X-Ray SDK sampling rate is configured too low, causing many requests to be skipped.
Why this is correct
Low sampling rate means fewer traces are recorded.
Related concept
Read the scenario before looking for a memorised answer.
✗
X-Ray requires the CloudWatch agent to be installed on all EC2 instances.
Why it's wrong here
X-Ray uses its own daemon or SDK; CloudWatch agent is not required.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume incomplete traces are due to infrastructure issues (daemon not running) rather than a configuration parameter (sampling rate), which is a subtle but common cause in distributed tracing.
Detailed technical explanation
How to think about this question
The X-Ray SDK implements sampling using a reservoir and a fixed rate per second (e.g., 1 request per second and 5% of additional requests). When the sampling rate is too low, the reservoir fills quickly and subsequent requests are dropped, causing gaps in the trace. This is configurable via the `sampling-rules` in the X-Ray console or SDK configuration, and the SDK logs sampling decisions to help diagnose such issues.
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.
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 X-Ray SDK sampling rate is configured too low, causing many requests to be skipped. — Option C is correct because the X-Ray SDK uses a sampling rate to decide which requests to record. If the sampling rate is set too low, a large percentage of requests are skipped, leading to incomplete traces. The DevOps engineer would observe missing segments for requests that were not sampled, even though the daemon and SDK are functioning correctly.
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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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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