ANS-C01 Network Management and Operations Practice Question
A company has a VPC with a NAT gateway in a public subnet. The security team wants to log all outbound traffic from private subnets to the internet. Which AWS service should be used to capture this 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 can be enabled on the NAT gateway's elastic network interface (ENI) to capture all outbound traffic from private subnets to the internet. Option B is incorrect because AWS CloudTrail logs API calls, not network traffic. Option C is incorrect because Amazon S3 Access Logs only log requests made to S3 buckets, not NAT gateway traffic. Option D is incorrect because AWS Config records configuration changes, 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
Flow Logs on the NAT gateway ENI capture all outbound traffic.
- ✗
AWS CloudTrail
Why it's wrong here
CloudTrail logs API calls, not network traffic.
- ✗
Amazon S3 Access Logs
Why it's wrong here
S3 Access Logs are for bucket access, not NAT gateway traffic.
- ✗
AWS Config
Why it's wrong here
Config tracks configuration changes, not traffic.
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.