ANS-C01 Network Security, Compliance and Governance Practice Question
A company needs to log all network traffic between EC2 instances in a VPC for security analysis. They want to capture metadata about traffic, including source and destination IP, ports, protocol, and packet counts. Which THREE AWS services or features can be used to achieve this? (Choose three.)
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
Options B, C, and D are correct because VPC Flow Logs capture metadata about network traffic (source/destination IP, ports, protocol, packet counts), Traffic Mirroring captures packets for deep inspection, and AWS Network Firewall provides flow logs for traffic passing through the firewall. Option A is wrong because CloudTrail logs API calls, not network traffic. Option E is wrong because Security Group rules logging does not exist; Security Groups do not log 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 CloudTrail
Why it's wrong here
CloudTrail logs API activity, not network traffic.
- ✓
VPC Flow Logs
Why this is correct
VPC Flow Logs capture IP traffic metadata at the network interface level.
- ✓
Traffic Mirroring
Why this is correct
Traffic Mirroring captures and inspects network traffic for security analysis.
- ✓
AWS Network Firewall flow logs
Why this is correct
Network Firewall can generate flow logs for traffic passing through it.
- ✗
Security Group rules logging
Why it's wrong here
Security Groups do not have native logging; they accept/deny traffic without logging.
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Variation 1. A security team requires that all traffic between Amazon EC2 instances in different subnets of a VPC be logged. Which AWS service should be used to capture and log the traffic?
easy- ✓ A.VPC Flow Logs
- B.AWS CloudTrail
- C.VPC Traffic Mirroring
- D.AWS Config
Why A: VPC Flow Logs capture IP traffic information for network interfaces and can be published to Amazon CloudWatch Logs or Amazon S3. This allows logging of all traffic between EC2 instances in different subnets. Option B is incorrect because AWS CloudTrail logs API calls and actions taken on AWS resources, not network traffic. Option C is incorrect because VPC Traffic Mirroring copies traffic for deep packet inspection and analysis, but it is not a logging service; it is used for traffic monitoring and security analysis. Option D is incorrect because AWS Config tracks resource configuration changes and evaluates compliance, 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.