ANS-C01 VPC Flow Logs Practice Question
A company needs to audit network traffic in a VPC for compliance. Which THREE AWS services can be used to capture and analyze network traffic?
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
✓
Traffic Mirroring
Traffic Mirroring captures and inspects traffic. Option C is correct because VPC Flow Logs capture IP traffic information. Option D is correct because AWS Network Firewall can log traffic. Option A is wrong because AWS Config monitors resource configurations, not traffic. Option E is wrong because CloudTrail logs API calls, not network traffic.
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 Config
Why it's wrong here
Config tracks resource configuration changes.
- ✓
Traffic Mirroring
Why this is correct
Traffic Mirroring captures and inspects traffic.
- ✓
VPC Flow Logs
Why this is correct
Flow logs capture network traffic metadata.
- ✓
AWS Network Firewall
Why this is correct
Network Firewall can log traffic that passes through it.
- ✗
AWS CloudTrail
Why it's wrong here
CloudTrail logs API activity, not network traffic.
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Same concept, more angles
3 more ways this is tested on ANS-C01
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 wants to audit all network traffic to and from EC2 instances for security analysis. Which AWS service should they enable?
easy- ✓ A.VPC Flow Logs
- B.Amazon GuardDuty
- C.AWS CloudTrail
- D.AWS Config
Why A: VPC Flow Logs capture information about IP traffic going to and from network interfaces in a VPC, making them the correct choice for auditing network traffic. Option A is correct. AWS CloudTrail records API calls, not network traffic. AWS Config records resource configuration changes. Amazon GuardDuty analyzes logs and flows for threats, but it does not capture the raw traffic itself.
Variation 2. A company has a requirement to audit all network traffic leaving a VPC. The traffic includes traffic to the internet, to on-premises via VPN, and to other VPCs via Transit Gateway. Which AWS service can capture and log all outbound traffic for compliance analysis?
hard- ✓ A.VPC Traffic Mirroring
- B.VPC Flow Logs
- C.AWS CloudTrail
- D.Amazon GuardDuty
Why A: (VPC Traffic Mirroring) is correct because it captures and copies all outbound network traffic, including full packets, for compliance analysis. Option B (VPC Flow Logs) is incorrect because it only logs metadata (e.g., IP addresses, ports, protocols) but not the full packet content. Option C (AWS CloudTrail) is incorrect because it logs API calls and management events, not network traffic. Option D (Amazon GuardDuty) is incorrect because it is a threat detection service that analyzes traffic for anomalies, but it does not log all traffic for auditing purposes.
Variation 3. A security team needs to audit all network traffic entering and leaving a VPC. Which AWS service should be used to capture IP traffic information?
easy- ✓ A.VPC Flow Logs
- B.AWS Config
- C.Amazon CloudWatch Logs
- D.AWS CloudTrail
Why A: VPC Flow Logs capture IP traffic information for network interfaces in a VPC, allowing auditing of all network traffic. Option B is wrong because AWS Config records resource configuration changes, not network traffic. Option C is wrong because Amazon CloudWatch Logs can store and monitor logs but does not capture network traffic. Option D is wrong because AWS CloudTrail records API calls, not network traffic.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.