- A
AWS CloudTrail
Why wrong: AWS CloudTrail logs API calls, not network traffic. It records management events and data events but does not capture IP traffic metadata.
- B
AWS Config
Why wrong: AWS Config evaluates resource configurations and compliance rules, not network traffic flows.
- C
Amazon GuardDuty
Why wrong: Amazon GuardDuty is a threat detection service that uses VPC Flow Logs, DNS logs, and CloudTrail logs for analysis, but it does not directly capture network traffic itself.
- D
VPC Flow Logs
VPC Flow Logs capture IP traffic metadata for all network interfaces in a VPC, providing visibility into traffic entering and leaving the VPC without agents or routing changes.
Question 1,355 of 1,705
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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 multiple subnets. They want to monitor all network traffic entering and leaving the VPC for security analysis. Which AWS service should they use?
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 Flow Logs
VPC Flow Logs capture IP traffic metadata (source/destination IP, ports, protocol, packet/byte counts) for all network interfaces in a VPC, including subnets, enabling security analysis of all traffic entering and leaving the VPC. This is the correct service because it provides network-level visibility into traffic flows without requiring agents or changes to routing.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
AWS CloudTrail logs API calls, not network traffic. It records management events and data events but does not capture IP traffic metadata.
- ✗
AWS Config
Why it's wrong here
AWS Config evaluates resource configurations and compliance rules, not network traffic flows.
- ✗
Amazon GuardDuty
Why it's wrong here
Amazon GuardDuty is a threat detection service that uses VPC Flow Logs, DNS logs, and CloudTrail logs for analysis, but it does not directly capture network traffic itself.
- ✓
VPC Flow Logs
Why this is correct
VPC Flow Logs capture IP traffic metadata for all network interfaces in a VPC, providing visibility into traffic entering and leaving the VPC without agents or routing changes.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse CloudTrail (API logging) or GuardDuty (threat detection) with the actual network traffic capture service, but VPC Flow Logs are the only option that directly records IP traffic metadata for all VPC network interfaces.
Detailed technical explanation
How to think about this question
VPC Flow Logs are published to Amazon CloudWatch Logs or Amazon S3, and each log record contains fields like version, account-id, interface-id, srcaddr, dstaddr, srcport, dstport, protocol, packets, bytes, start, end, action (ACCEPT/REJECT), and log-status. A subtle behavior is that flow logs do not capture traffic to Amazon DNS servers (169.254.169.253), Amazon DHCP servers, or Amazon Instance Metadata Service (169.254.169.254), so security analysis must account for these gaps.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: VPC Flow Logs — VPC Flow Logs capture IP traffic metadata (source/destination IP, ports, protocol, packet/byte counts) for all network interfaces in a VPC, including subnets, enabling security analysis of all traffic entering and leaving the VPC. This is the correct service because it provides network-level visibility into traffic flows without requiring agents or changes to routing.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 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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