The answer is ensuring the X-Ray daemon is running on all EC2 instances and instrumenting your application with the X-Ray SDK. The daemon acts as a local relay, collecting trace segments from the SDK and sending them to the AWS X-Ray service via UDP; without it running on each instance, trace data never leaves the host. The SDK, meanwhile, must be integrated into your application code to generate those segments in the first place—it sends data to the daemon, not directly to the API. On the DVA-C02 exam, this pairing tests your understanding that the daemon is a per-instance process, not a centralized service, and that the CloudWatch agent is a separate tool for logs and metrics, not traces. A common trap is assuming the daemon can be run once for the entire environment or that it uses TCP. Remember the memory tip: “Daemon on every box, SDK in every app” to keep traces complete.
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. 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 developer is using AWS X-Ray to trace requests through a microservices application. The developer notices that some traces are incomplete. Which TWO actions can help ensure complete traces?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the X-Ray SDK to instrument the application code.
Option A: The X-Ray daemon must be running on each EC2 instance to send trace data. Option B: Instrumentation with the SDK sends trace data to the daemon. Option C is wrong because CloudWatch agent is separate. Option D is wrong because the daemon uses UDP. Option E is wrong because the daemon is not centralized.
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 the X-Ray SDK to instrument the application code.
Why this is correct
SDK intercepts requests and sends trace data.
Related concept
Read the scenario before looking for a memorised answer.
✗
Open port 2000 on the security groups for TCP traffic.
Deploy the X-Ray daemon as a centralized service in a separate instance.
Why it's wrong here
Each instance should run its own daemon.
✗
Install the CloudWatch agent on all instances.
Why it's wrong here
CloudWatch agent is for logs and metrics, not X-Ray.
✓
Ensure the X-Ray daemon is running on all EC2 instances.
Why this is correct
The daemon is required to receive and forward trace segments.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Identify which DVA-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.
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use the X-Ray SDK to instrument the application code. — Option A: The X-Ray daemon must be running on each EC2 instance to send trace data. Option B: Instrumentation with the SDK sends trace data to the daemon. Option C is wrong because CloudWatch agent is separate. Option D is wrong because the daemon uses UDP. Option E is wrong because the daemon is not centralized.
What should I do if I get this DVA-C02 question wrong?
Identify which DVA-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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This DVA-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 DVA-C02 exam.
Question Discussion
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