SCS-C02 Threat Detection and Incident Response Practice Question
A company uses AWS Lambda functions to process data from an S3 bucket. The security team wants to detect any unauthorized attempts to invoke the Lambda function from outside the company's VPC. The Lambda function is configured to be VPC-enabled and is attached to a VPC with a security group. The team has enabled CloudTrail and VPC Flow Logs. However, they are not seeing any logs for the Lambda invocations in CloudTrail. The team has checked that CloudTrail is logging management events and that the Lambda function is being invoked. What is the most likely reason for the missing CloudTrail logs?
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
✓
CloudTrail is not logging Lambda Invoke API calls because they are data events, not management events.
CloudTrail management events do not include Lambda Invoke API calls because these are data events, not management events. To log Lambda invocations, data events must be explicitly enabled in the CloudTrail trail configuration. Option B is incorrect because Lambda functions do not need to be configured to send logs to CloudTrail; CloudTrail automatically captures API calls if configured. Option C is incorrect as the issue is not about configuring data events; the question states data events are not enabled. Option D is incorrect because VPC Flow Logs capture network traffic, not Lambda invocations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
CloudTrail is not logging Lambda Invoke API calls because they are data events, not management events.
Why this is correct
Invoke calls are data events and require enabling data events in CloudTrail.
- ✗
The Lambda function is not configured to send logs to CloudTrail.
Why it's wrong here
Lambda functions do not send logs to CloudTrail; CloudTrail captures API calls.
- ✗
The CloudTrail trail is not configured to log data events for Lambda.
Why it's wrong here
CloudTrail management events capture Lambda management calls, but Invoke is a data event.
- ✗
VPC Flow Logs are not enabled for the Lambda function's VPC.
Why it's wrong here
VPC Flow Logs capture network traffic, not API calls.
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 |
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SCS-C02 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 SCS-C02 exam.