This ANS-C01 practice question tests your understanding of network management and operations. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 has a VPC with a NAT gateway in a public subnet. The security team wants to log all outbound traffic from private subnets to the internet. Which AWS service should be used to capture this traffic?
VPC Flow Logs
Flow Logs on the NAT gateway ENI capture all outbound traffic.
AWS CloudTrail
Why wrong: CloudTrail logs API calls, not network traffic.
Amazon S3 Access Logs
Why wrong: S3 Access Logs are for bucket access, not NAT gateway traffic.
AWS Config
Why wrong: Config tracks configuration changes, not traffic.
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
The correct answer is B because VPC Flow Logs can be enabled on the NAT gateway's elastic network interface to capture all outbound traffic. Option A is wrong because CloudTrail does not capture network traffic. Option C is wrong because AWS Config does not log traffic. Option D is wrong because S3 Access Logs are for S3 bucket access, not NAT gateway traffic.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
VPC Flow Logs
AWS CloudTrail
Why it's wrong here
CloudTrail logs API calls, not network traffic.
Amazon S3 Access Logs
AWS Config
Why it's wrong here
Config tracks configuration changes, not traffic.
Common exam traps
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Network Management and Operations — This question tests Network Management and Operations — CIDR notation defines the prefix length..
The correct answer is: VPC Flow Logs — The correct answer is B because VPC Flow Logs can be enabled on the NAT gateway's elastic network interface to capture all outbound traffic. Option A is wrong because CloudTrail does not capture network traffic. Option C is wrong because AWS Config does not log traffic. Option D is wrong because S3 Access Logs are for S3 bucket access, not NAT gateway traffic.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 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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