ANS-C01 Network Management and Operations Practice Question
A network engineer needs to capture TCP traffic between an EC2 instance (eni-abc123) and an RDS instance (eni-def456) in the same VPC for troubleshooting. Which AWS service should be used to capture the traffic and store it in S3?
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 at the network interface level and can be published to S3. They can filter traffic by ENI, so they can capture traffic between eni-abc123 and eni-def456. Option D is correct. Amazon Inspector (A) is for vulnerability assessment, not traffic capture. AWS CloudTrail (B) records API activity, not network traffic. AWS Config (C) tracks configuration changes, not packet-level data.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon Inspector
Why it's wrong here
Amazon Inspector is a vulnerability management service, not a network traffic capture tool.
- ✗
AWS CloudTrail
Why it's wrong here
CloudTrail records API calls, not network traffic between instances.
- ✗
AWS Config
Why it's wrong here
AWS Config tracks resource configurations, not network traffic.
- ✓
VPC Flow Logs
Why this is correct
VPC Flow Logs capture IP traffic information for network interfaces and can be published to S3 or CloudWatch Logs.
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.