The answer is Transparent Data Encryption (TDE) with customer-managed keys (CMK). This secures data at rest in Azure Synapse Analytics by encrypting the database encryption key (DEK) using a key you control in Azure Key Vault, a method known as bring your own key (BYOK). TDE automatically encrypts data as it is written to storage and decrypts it on read, without requiring changes to the application. On the DP-900 exam, this concept tests your understanding of encryption responsibilities and key management options within Azure’s platform-as-a-service offerings. A common trap is confusing TDE with column-level encryption or network security—remember that TDE protects the entire database at the storage layer, not individual columns. For the exam, focus on the distinction between service-managed keys and customer-managed keys, as the latter provides separation of duties and is a key scenario for compliance. Memory tip: TDE = “Total Disk Encryption” for the entire database, and CMK = “Customer Must Keep” the key in Key Vault.
DP-900 Describe an analytics workload on Azure Practice Question
This DP-900 practice question tests your understanding of describe an analytics workload on azure. 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.
Which TWO options are valid ways to secure data at rest in Azure Synapse Analytics?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Customer-managed keys (CMK) with TDE
Customer-managed keys (CMK) with TDE is a valid method to secure data at rest in Azure Synapse Analytics because it allows you to bring your own key (BYOK) to encrypt the database encryption key (DEK), which is stored in Azure Key Vault. This provides an additional layer of control and separation of duties, ensuring that only authorized users can access the encryption keys and thus the underlying data.
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.
✓
Customer-managed keys (CMK) with TDE
Why this is correct
Provides additional control over encryption keys.
Related concept
Read the scenario before looking for a memorised answer.
Read the scenario before looking for a memorised answer.
✗
Always Encrypted
Why it's wrong here
Encrypts data in transit and at rest, but it is client-side and not natively integrated with Synapse.
✗
Column-level security
Why it's wrong here
Controls access to columns but does not encrypt data at rest.
✗
Dynamic Data Masking
Why it's wrong here
Masks data in query results but does not encrypt at rest.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Dynamic Data Masking or Column-level security with data-at-rest encryption, but these are access control or obfuscation features, not encryption mechanisms that protect data stored on disk.
Detailed technical explanation
How to think about this question
Under the hood, TDE in Azure Synapse Analytics uses an AES-256 encryption algorithm to encrypt the database files at the page level, with the DEK stored in the database boot record. When using CMK, the DEK is encrypted by a key stored in Azure Key Vault, enabling key rotation and revocation without re-encrypting the entire database. In a real-world scenario, organizations with compliance requirements like PCI-DSS or HIPAA often use CMK to maintain full control over encryption keys and meet auditability standards.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-900 question in full detail.
Describe an analytics workload on Azure — This question tests Describe an analytics workload on Azure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Customer-managed keys (CMK) with TDE — Customer-managed keys (CMK) with TDE is a valid method to secure data at rest in Azure Synapse Analytics because it allows you to bring your own key (BYOK) to encrypt the database encryption key (DEK), which is stored in Azure Key Vault. This provides an additional layer of control and separation of duties, ensuring that only authorized users can access the encryption keys and thus the underlying data.
What should I do if I get this DP-900 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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