The correct answer is to enable DynamoDB encryption at rest using AWS KMS and use IAM policies to restrict access. This combination works because DynamoDB encryption at rest with KMS automatically encrypts all data on disk using a customer master key, ensuring that sensitive health information is protected at the storage layer, while IAM policies provide the necessary fine-grained authorization to control which services or principals can interact with the table. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of the separation between encryption mechanisms and access control—a common trap is confusing server-side encryption with client-side encryption or assuming encryption alone handles authorization. Remember that KMS handles the “what” (encrypting the data), while IAM handles the “who” (allowing access). A useful memory tip: “KMS locks the chest, IAM hands out the keys.”
DBS-C01 Workload-Specific Database Design Practice Question
This DBS-C01 practice question tests your understanding of workload-specific database design. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A healthcare application stores patient records in Amazon DynamoDB. Each record has a unique patient ID and contains sensitive health information. The application must encrypt data at rest and ensure that only authorized services can access the data. Which combination of design choices meets these requirements?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable DynamoDB encryption at rest using AWS KMS and use IAM policies to restrict access.
Option C is correct because DynamoDB encryption at rest using AWS KMS provides server-side encryption for sensitive patient data, while IAM policies allow fine-grained access control to ensure only authorized services can access the table. This combination directly meets both the encryption and access control requirements without unnecessary complexity or service mismatches.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Implement client-side encryption and use Lambda to validate access.
Why it's wrong here
Client-side encryption is more complex and not necessary.
✗
Enable S3 server-side encryption with AWS KMS and use bucket policies.
Why it's wrong here
S3 is not the database service.
✓
Enable DynamoDB encryption at rest using AWS KMS and use IAM policies to restrict access.
Why this is correct
DynamoDB integrates with KMS for encryption and IAM for access control.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use AWS CloudHSM for key storage and VPC endpoints for access control.
Why it's wrong here
CloudHSM is not integrated with DynamoDB encryption.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse encryption mechanisms across services (e.g., applying S3 encryption to DynamoDB) or assume that network controls like VPC endpoints replace the need for IAM-based authorization.
Detailed technical explanation
How to think about this question
DynamoDB encryption at rest uses an AWS KMS customer master key (CMK) to encrypt table data and its backups, with the encryption applied transparently at the storage layer before writing to SSDs. IAM policies can restrict access at the table, item, or attribute level using condition keys like 'dynamodb:LeadingKeys' for partition key-based access, enabling fine-grained authorization for multi-tenant healthcare applications.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable DynamoDB encryption at rest using AWS KMS and use IAM policies to restrict access. — Option C is correct because DynamoDB encryption at rest using AWS KMS provides server-side encryption for sensitive patient data, while IAM policies allow fine-grained access control to ensure only authorized services can access the table. This combination directly meets both the encryption and access control requirements without unnecessary complexity or service mismatches.
What should I do if I get this DBS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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