**KMS role**: Centralized key management. Creates and controls encryption keys. Used by S3, EBS, RDS, Lambda for encryption. **Why KMS**: Key lifecycle (creation, rotation, deletion); audit via CloudTrail; access control via IAM. **CMK**: Customer-managed keys—you control policy...
This easy-level Cloud/Tools question appears frequently in data engineering interviews at companies like Nielsen. While less common, it tests deeper understanding that distinguishes strong candidates.
Start by clearly defining the core concept being asked about. Interviewers want to see that you understand the fundamentals before diving into implementation details. Structure your answer with a definition, then explain the practical application with a concise example.
KMS role: Centralized key management. Creates and controls encryption keys. Used by S3, EBS, RDS, Lambda for encryption. Why KMS: Key lifecycle (creation, rotation, deletion); audit via CloudTrail; access control via IAM. CMK: Customer-managed keys—you control policy and rotation. AWS-managed keys are simpler but less control. Best practice: Use CMK for compliance (audit trail). Enable automatic rotation (annual for symmetric). Cost: $1/month per key; $0.03/10K requests. At scale, consider data key caching.
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Analyze My Answer — FreeAccording to DataEngPrep.tech, this is one of the most frequently asked Cloud/Tools interview questions, reported at 1 company. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.