CV0-004 Operations and Support Practice Question
A cloud engineer is troubleshooting a performance issue in a multi-tier application on AWS. The web tier shows high latency, but the application logs indicate no errors. The engineer wants to trace a request end-to-end across services. Which AWS service should be used?
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
✓
AWS X-Ray
AWS X-Ray provides distributed tracing, allowing you to trace requests as they travel through your application and identify performance bottlenecks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
VPC Flow Logs
Why it's wrong here
VPC Flow Logs capture IP-level metadata for traffic traversing ENIs, subnets or VPCs, so they reveal accepted/rejected packets but not per-request latency or service call chains. They are the right tool for network reachability and security auditing, not distributed tracing, which AWS X-Ray provides.
- ✗
Amazon CloudWatch Logs
Why it's wrong here
CloudWatch Logs aggregates log events but does not correlate a single request across services or produce latency traces; it lacks the trace and segment model needed for end-to-end visibility. It is tempting because logs are already collected, and would be correct for searching and alerting on log patterns.
- ✗
AWS CloudTrail
Why it's wrong here
CloudTrail records AWS API activity for auditing and governance, not request latency or service-to-service call paths, so it cannot trace a request end-to-end. It is tempting for its cross-service visibility, and would be correct for auditing who made which API call and when.
- ✓
AWS X-Ray
Why this is correct
AWS X-Ray traces requests across distributed services, building a service map that pinpoints latency between tiers. Since logs show no errors, the bottleneck is performance rather than failure, and X-Ray's segment and subsegment timing exposes exactly where the web tier's downstream calls stall.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.