This ANS-C01 practice question tests your understanding of network management and operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 network engineer needs to capture and analyze traffic crossing a VPC peering connection for troubleshooting. Which AWS service should be used?
AWS CloudTrail.
Why wrong: CloudTrail captures API calls, not network traffic.
VPC Traffic Mirroring.
Why wrong: Traffic Mirroring copies traffic from ENIs, not directly for peering.
AWS Transit Gateway Network Manager.
Why wrong: Network Manager visualizes topology but does not capture traffic.
VPC Flow Logs for the peering connection.
Flow Logs capture IP traffic metadata.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
VPC Flow Logs for the peering connection.
VPC Flow Logs capture IP traffic information for network interfaces, including those attached to a VPC peering connection. They can be published to Amazon CloudWatch Logs or Amazon S3, and the logs contain fields such as source/destination IP, ports, protocol, and packet/byte counts, which are essential for troubleshooting traffic across the peering link. This is the correct service because it directly logs metadata about the traffic traversing the peering connection without requiring any changes to the network path.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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 captures API calls, not network traffic.
VPC Traffic Mirroring.
Why it's wrong here
Traffic Mirroring copies traffic from ENIs, not directly for peering.
AWS Transit Gateway Network Manager.
Why it's wrong here
Network Manager visualizes topology but does not capture traffic.
VPC Flow Logs for the peering connection.
Why this is correct
Flow Logs capture IP traffic metadata.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates confuse VPC Flow Logs (which log traffic metadata) with VPC Traffic Mirroring (which captures full packet payloads), but Traffic Mirroring cannot be applied to a peering connection itself, only to individual ENIs within a VPC.
Detailed technical explanation
VPC Flow Logs for a peering connection are enabled at the peering connection resource level, not at individual ENIs, and they capture traffic in both directions (requester and accepter). The logs include the 'pkt-src-aws-service' and 'pkt-dst-aws-service' fields to identify traffic from AWS services, and they can be aggregated across multiple VPCs for centralized analysis. A real-world scenario is troubleshooting asymmetric routing or dropped packets due to security group or NACL rules, where flow logs reveal whether traffic is being accepted or rejected (via the 'action' field).
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
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FAQ
Network Management and Operations — This question tests Network Management and Operations — Read the scenario before looking for a memorised answer..
The correct answer is: VPC Flow Logs for the peering connection. — VPC Flow Logs capture IP traffic information for network interfaces, including those attached to a VPC peering connection. They can be published to Amazon CloudWatch Logs or Amazon S3, and the logs contain fields such as source/destination IP, ports, protocol, and packet/byte counts, which are essential for troubleshooting traffic across the peering link. This is the correct service because it directly logs metadata about the traffic traversing the peering connection without requiring any changes to the network path.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This ANS-C01 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 ANS-C01 exam.
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