DEA-C01 Data Ingestion and Transformation Practice Question
Network Topology
Refer to the exhibit. A Lambda function named 'IngestionProcessor' is failing. The engineer checks CloudWatch Logs and sees the log group exists but storedBytes is 0. Why might the logs show no data?
⚠ Common exam trap
The DEA-C01 exam often tests the distinction between log group creation (which requires `logs:CreateLogGroup`) and log writing (which requires `logs:CreateLogStream` and `logs:PutLogEvents`), leading candidates to confuse the existence of a log group with successful log delivery.
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
✓
The Lambda execution role does not have permission to write logs to CloudWatch
The Lambda execution role must have the `logs:CreateLogStream` and `logs:PutLogEvents` permissions to write logs to CloudWatch Logs. If the role lacks these permissions, the log group will be created (if it doesn't exist) but no log events will be written, resulting in `storedBytes` being 0. This is a common misconfiguration when the IAM policy does not include the necessary CloudWatch Logs actions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The Lambda execution role does not have permission to write logs to CloudWatch
Why this is correct
Without logs:CreateLogGroup, CreateLogStream, PutLogEvents, logs are not written.
- ✗
The Lambda function is configured with a dead letter queue
Why it's wrong here
DLQ does not prevent log writing.
- ✗
The Lambda function has not been invoked yet
Why it's wrong here
The function is failing, so it should have been invoked.
- ✗
The log group is encrypted with a KMS key and the Lambda function lacks decrypt permission
Why it's wrong here
If the log group is encrypted, but storedBytes 0 suggests no attempts; permission issue is more fundamental.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-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 DEA-C01 exam.