Quick Answer
The correct answer is VPC Flow Logs. This AWS service captures IP traffic metadata for troubleshooting and security analysis by recording source and destination IPs, ports, protocol, and packet counts, but never the packet payload, which perfectly matches the requirement for metadata-only monitoring without the overhead or privacy concerns of full packet capture. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding of the distinction between VPC Flow Logs (layer 3/4 metadata) and services like Traffic Mirroring or network ACLs—a common trap is confusing flow logs with full packet capture. Remember that VPC Flow Logs are for metadata, not payload; think “logs, not packets” to avoid the trap.
This ANS-C01 practice question tests your understanding of network design. 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 company wants to monitor network traffic in their VPC for troubleshooting and security analysis. They need to capture IP traffic information, including source/destination IPs, ports, and protocol, but not the packet payload. Which AWS service should be used?
Amazon CloudWatch Logs.
Why wrong: CloudWatch Logs is a destination for logs, not a capture service.
AWS Network Firewall.
Why wrong: Network Firewall is for filtering, not for capturing metadata logs.
VPC Flow Logs.
VPC Flow Logs capture metadata without payload.
AWS Traffic Mirroring.
Why wrong: Traffic Mirroring copies full packets, which includes payload, and is more for deep analysis.
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.
VPC Flow Logs capture metadata about IP traffic in a VPC, including source/destination IPs, ports, protocol, and packet counts, but never the payload. This meets the requirement for troubleshooting and security analysis without the overhead or privacy concerns of full packet capture.
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.
Amazon CloudWatch Logs.
Why it's wrong here
CloudWatch Logs is a destination for logs, not a capture service.
AWS Network Firewall.
Why it's wrong here
Network Firewall is for filtering, not for capturing metadata logs.
VPC Flow Logs.
Why this is correct
VPC Flow Logs capture metadata without payload.
Related concept
Read the scenario before looking for a memorised answer.
AWS Traffic Mirroring.
Why it's wrong here
Traffic Mirroring copies full packets, which includes payload, and is more for deep analysis.
Common exam traps
The trap here is that candidates confuse VPC Flow Logs (metadata only) with AWS Traffic Mirroring (full packet capture), assuming both provide payload data, but the question explicitly excludes payload capture.
Detailed technical explanation
VPC Flow Logs use a built-in agent in the VPC network stack to collect flow records, which are aggregated and published to Amazon CloudWatch Logs or Amazon S3. The logs follow a structured format (e.g., version 2 includes fields like srcaddr, dstaddr, srcport, dstport, protocol, and action), and they are generated for both accepted and rejected traffic based on security group and NACL rules. A subtle behavior is that flow logs do not capture traffic to Amazon DNS servers or Amazon Windows license activation by default, which can lead to gaps in monitoring if not accounted for.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
The correct answer is: VPC Flow Logs. — VPC Flow Logs capture metadata about IP traffic in a VPC, including source/destination IPs, ports, protocol, and packet counts, but never the payload. This meets the requirement for troubleshooting and security analysis without the overhead or privacy concerns of full packet capture.
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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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company has a VPC with multiple subnets. They want to monitor all network traffic to and from an EC2 instance for troubleshooting. Which AWS service should they use?
mediumWhy C: VPC Flow Logs capture IP traffic information and can be used to monitor network traffic. AWS CloudTrail records API calls, not network traffic. Amazon Inspector is for security assessments. AWS Config tracks resource configuration. Amazon GuardDuty is for threat detection.
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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