The correct answer is to enable Transparent Data Encryption (TDE) on the dedicated SQL pool, combined with Always Encrypted for sensitive columns. TDE performs real-time I/O encryption and decryption of the database, backup files, and transaction logs at the page level, requiring no changes to existing applications. Always Encrypted complements this by allowing client-side encryption of specific column data, ensuring that even database administrators cannot view the plaintext values. On the DP-203 exam, this question tests your understanding of Azure Synapse’s layered security model, where TDE handles bulk data-at-rest encryption while Always Encrypted protects high-sensitivity columns from privileged users. A common trap is confusing Dynamic Data Masking or Column-Level Security with encryption—these control access or mask output but do not encrypt stored data. Remember the mnemonic: “TDE for the whole bed, Always Encrypted for the head” (bulk storage vs. sensitive columns).
DP-203 Practice Question: Secure, monitor, and optimize data storage and data processing
This DP-203 practice question tests your understanding of secure, monitor, and optimize data storage and data processing. 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 actions should you take to secure data at rest in Azure Synapse Analytics dedicated SQL pools?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Always Encrypted with secure enclaves for specific columns.
Option A is correct: Transparent Data Encryption (TDE) encrypts data at rest without application changes. Option D is correct: Always Encrypted protects sensitive columns with client-side encryption. Option B (Dynamic Data Masking) is for masking data in query results, not at rest. Option C (Azure RBAC) is for access control, not encryption. Option E (Column-level security) is for access control, not encryption.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 Always Encrypted with secure enclaves for specific columns.
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-203 question in full detail.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related DP-203 subnetting questions on CIDR, address ranges, and subnet selection.
Secure, monitor, and optimize data storage and data processing — This question tests Secure, monitor, and optimize data storage and data processing — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Use Always Encrypted with secure enclaves for specific columns. — Option A is correct: Transparent Data Encryption (TDE) encrypts data at rest without application changes. Option D is correct: Always Encrypted protects sensitive columns with client-side encryption. Option B (Dynamic Data Masking) is for masking data in query results, not at rest. Option C (Azure RBAC) is for access control, not encryption. Option E (Column-level security) is for access control, not encryption.
What should I do if I get this DP-203 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related DP-203 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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