The answer is transparent data encryption (TDE) and role-based access control (RBAC). TDE protects data at rest by encrypting database files at the storage level, rendering them unreadable if physical media is stolen, while RBAC restricts access to authorized users based on their defined roles, preventing unauthorized viewing or modification of stored data. On the CISA exam, this pairing tests your understanding that data at rest protection requires both encryption for confidentiality against physical threats and access controls for logical security against insider misuse. A common trap is choosing only one control, such as encryption alone, and forgetting that RBAC addresses the authorization layer. Remember the mnemonic "TDE for the drive, RBAC for the back" — encryption secures the storage device, while role-based controls secure who gets in the back door.
CISA Protection of Information Assets Practice Question
This CISA practice question tests your understanding of protection of information assets. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which TWO controls are most effective for protecting data at rest on a database server? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enforcing role-based access control (RBAC)
Role-based access control (RBAC) restricts data access to authorized users based on their roles, directly preventing unauthorized viewing or modification of data at rest. Transparent data encryption (TDE) encrypts the database files at the storage level, ensuring that even if the physical media is stolen, the data remains unreadable without the encryption keys. Both controls address the core requirement of protecting data while it is stored on the database server.
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.
✗
Placing the database server behind a firewall
Why it's wrong here
Network segmentation is a perimeter control, not data at rest protection.
✓
Enforcing role-based access control (RBAC)
Why this is correct
RBAC ensures only authorized users can access data.
Related concept
Read the scenario before looking for a memorised answer.
File-level encryption is possible but less integrated than TDE for databases.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse network controls (firewall, SSL/TLS) with data-at-rest protection, mistakenly thinking perimeter security or transport encryption secures stored data, when in fact they only protect data in motion or the network layer.
Detailed technical explanation
How to think about this question
TDE operates at the page level, encrypting data as it is written to disk and decrypting it when read into memory, using a database encryption key (DEK) stored in the database boot record and protected by a certificate or asymmetric key. RBAC in databases like SQL Server or Oracle uses granular permissions (e.g., SELECT, INSERT) tied to roles, which can be audited via SQL Server Audit or Oracle Fine-Grained Auditing. A real-world scenario: a database server in a cloud environment where the physical disks are managed by the provider—TDE ensures data is encrypted even if the provider's staff accesses the storage, while RBAC prevents unauthorized internal users from querying sensitive columns.
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 practitioner preparing for the CISA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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.
Protection of Information Assets — This question tests Protection of Information Assets — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enforcing role-based access control (RBAC) — Role-based access control (RBAC) restricts data access to authorized users based on their roles, directly preventing unauthorized viewing or modification of data at rest. Transparent data encryption (TDE) encrypts the database files at the storage level, ensuring that even if the physical media is stolen, the data remains unreadable without the encryption keys. Both controls address the core requirement of protecting data while it is stored on the database server.
What should I do if I get this CISA 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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