ANS-C01 Network Security, Compliance and Governance Practice Question
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?
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 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.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
VPC Flow Logs
Why this is correct
VPC Flow Logs capture network traffic metadata and can be logged to CloudWatch Logs or S3.
- ✗
AWS CloudTrail
Why it's wrong here
CloudTrail records API activity, not network traffic.
- ✗
VPC Traffic Mirroring
Why it's wrong here
Traffic Mirroring copies traffic for analysis but does not inherently log it.
- ✗
AWS Config
Why it's wrong here
AWS Config records resource configuration changes, not traffic data.
Visual reference
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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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.