ANS-C01 Network Management and Operations Practice Question
A company has deployed a transit gateway with multiple VPC attachments and VPN attachments. The network team notices that traffic between two VPCs is taking an unexpected path and experiencing high latency. Which tool should be used to trace the path and identify the specific transit gateway route table that is being 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
✓
VPC Reachability Analyzer
VPC Reachability Analyzer performs connectivity and path analysis between sources and destinations, showing the route table decisions, including the specific transit gateway route table used. Option D is correct. Options A (CloudTrail), B (CloudWatch ServiceLens), and C (X-Ray) are not designed for path tracing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
AWS CloudTrail
Why it's wrong here
CloudTrail records API calls, not network paths.
- ✗
Amazon CloudWatch ServiceLens
Why it's wrong here
ServiceLens combines traces and metrics for application monitoring, not network path analysis.
- ✗
AWS X-Ray
Why it's wrong here
AWS X-Ray traces application-layer requests and generates service maps for debugging distributed applications, not network-layer packet paths. It cannot inspect transit gateway route tables or reveal which route table is steering traffic between VPCs. X-Ray would be tempting because it visualises request flows across microservices, which resembles the idea of "tracing a path"; however, it operates at Layer 7 (HTTP/SQL calls) rather than Layer 3 IP routing, so it is correct only for diagnosing application performance issues, not for identifying the specific transit gateway route table in use.
- ✓
VPC Reachability Analyzer
Why this is correct
Reachability Analyzer performs path analysis between resources and shows the route table decisions, including transit gateway routes.
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Written by Johnson Ajibi, MSc IT Security
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