Question 984 of 968
hardMultiple SelectObjective-mapped
CAS-004 Practice Question: Is deploying a new cloud-based application that…
An organization is deploying a new cloud-based application that processes personally identifiable information (PII). The security team must ensure data at rest is encrypted. Which THREE of the following controls should be implemented to protect the data? (Select THREE.)
⚠ Common exam trap
The CAS-004 exam often tests the distinction between encryption for data at rest (e.g., TDE, AES-256, KMS) and encryption for data in transit (e.g., TLS), so candidates mistakenly select TLS as a data-at-rest control.
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
✓
Implement a key management system (KMS) with automatic key rotation.
A key management system (KMS) with automatic key rotation ensures that encryption keys are securely stored, rotated, and managed, which is essential for protecting data at rest. Without proper key management, encryption can be rendered ineffective if keys are compromised or stale. This control directly supports the confidentiality of PII stored in the cloud.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use tokenization for all PII fields in the database.
Why it's wrong here
Tokenization is a data masking technique, not encryption at rest.
- ✓
Implement a key management system (KMS) with automatic key rotation.
Why this is correct
Proper key management and rotation are critical to maintaining encryption security.
- ✓
Enable transparent data encryption (TDE) on the database.
Why this is correct
TDE encrypts the database files at rest.
- ✓
Use AES-256 encryption for all stored data.
Why this is correct
AES-256 is a strong encryption standard suitable for data at rest.
- ✗
Configure TLS 1.3 for all data connections.
Why it's wrong here
TLS protects data in transit, not at rest.
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Last reviewed: Jun 11, 2026
This CAS-005 practice question is part of Courseiva's free CompTIA 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 CAS-005 exam.
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