ANS-C01 Network Management and Operations Practice Question
A network engineer is troubleshooting high latency on an AWS Transit Gateway that connects multiple VPCs and an on-premises network via AWS Site-to-Site VPN. The engineer wants to identify potential causes. Which TWO actions should the engineer take? (Choose two.)
⚠ Common exam trap
Watch out — candidates often confuse VPC Flow Logs with Transit Gateway Flow Logs, assuming VPC Flow Logs can diagnose Transit Gateway latency, but VPC Flow Logs lack the attachment-level context and latency metrics needed for this specific troubleshooting scenario.
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
✓
Review the CloudWatch metrics for the VPN tunnels for packet loss and latency.
CloudWatch metrics for VPN tunnels provide direct visibility into packet loss and latency, which are key indicators of performance issues on the AWS Site-to-Site VPN component of the Transit Gateway. Option C is correct because Transit Gateway Flow Logs capture IP traffic information between attachments, allowing the engineer to analyze traffic patterns, identify drops, and pinpoint which VPC or VPN attachment is contributing to the high latency.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Review the NACL rules for each subnet in the VPCs.
Why it's wrong here
NACLs affect allowed traffic but not latency.
- ✓
Review the CloudWatch metrics for the VPN tunnels for packet loss and latency.
Why this is correct
VPN tunnel metrics can indicate performance issues.
- ✓
Enable Transit Gateway Flow Logs to capture traffic between attachments.
Why this is correct
Transit Gateway Flow Logs provide visibility into traffic flows.
- ✗
Re-create the VPN connections to reset the tunnels.
Why it's wrong here
Re-creating is a disruptive action, not a diagnostic step.
- ✗
Enable VPC Flow Logs on the VPCs attached to the transit gateway.
Why it's wrong here
VPC Flow Logs do not capture transit gateway traffic.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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