- A
Enable Microsoft Defender for SQL
Why wrong: Microsoft Defender for SQL provides security monitoring and threat detection, not encryption or backup.
- B
Implement dynamic data masking on sensitive columns
Why wrong: Dynamic data masking obfuscates data but does not encrypt it.
- C
Enable Always Encrypted for all columns containing sensitive data
Why wrong: Always Encrypted encrypts data in transit between client and server, but it is not required for data at rest or for PITR. It also requires application changes.
- D
Enable transparent data encryption (TDE) on the database
TDE encrypts data at rest, including backups and transaction log files.
- E
Configure the point-in-time restore (PITR) retention period to 35 days
PITR allows restoring the database to any point within the retention period.
Quick Answer
The answer is to configure Transparent Data Encryption (TDE) for data at rest and set the point-in-time restore (PITR) retention period to 35 days. TDE automatically encrypts the database files, log files, and backups at rest without requiring application changes, while PITR enables you to restore the database to any point within the specified retention window, meeting the compliance requirement for 35 days of recoverability. On the DP-300 exam, this question tests your ability to distinguish between encryption layers: TDE handles storage-level encryption, whereas data in transit is secured by enforcing TLS connections at the server level, not by Always Encrypted or Dynamic Data Masking. A common trap is confusing Always Encrypted with transport encryption—Always Encrypted protects data end-to-end between client and database, but the exam expects TLS for standard transit security. Memory tip: TDE for rest, TLS for transit, and PITR for time travel.
DP-300 Implement a secure environment Practice Question
This DP-300 practice question tests your understanding of implement a secure environment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
You are a database administrator for a bank that uses Azure SQL Database to store transaction data. The compliance team requires that you implement a solution to encrypt data at rest and in transit. Additionally, the solution must allow the database to be restored to any point in time within the last 35 days. Which TWO actions should you take?
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
Enable transparent data encryption (TDE) on the database
Options A and B are correct. Option A enables transparent data encryption (TDE) for data at rest. Option B configures point-in-time restore (PITR) for the required retention of 35 days. Option C is wrong because Always Encrypted encrypts data in transit between client and server, but the question requires data in transit between the database and client, which is typically handled by TLS (enforced by the server). Option D is wrong because dynamic data masking does not encrypt data. Option E is wrong because Microsoft Defender for SQL provides threat detection, not encryption or backup.
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.
- ✗
Enable Microsoft Defender for SQL
Why it's wrong here
Microsoft Defender for SQL provides security monitoring and threat detection, not encryption or backup.
- ✗
Implement dynamic data masking on sensitive columns
Why it's wrong here
Dynamic data masking obfuscates data but does not encrypt it.
- ✗
Enable Always Encrypted for all columns containing sensitive data
Why it's wrong here
Always Encrypted encrypts data in transit between client and server, but it is not required for data at rest or for PITR. It also requires application changes.
- ✓
Enable transparent data encryption (TDE) on the database
- ✓
Configure the point-in-time restore (PITR) retention period to 35 days
Why this is correct
PITR allows restoring the database to any point within the retention period.
Related concept
CIDR notation defines the prefix length.
Common exam traps
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
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-300 subnetting questions on CIDR, address ranges, and subnet selection.
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Implement a secure environment — study guide chapter
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FAQ
Questions learners often ask
What does this DP-300 question test?
Implement a secure environment — This question tests Implement a secure environment — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Enable transparent data encryption (TDE) on the database — Options A and B are correct. Option A enables transparent data encryption (TDE) for data at rest. Option B configures point-in-time restore (PITR) for the required retention of 35 days. Option C is wrong because Always Encrypted encrypts data in transit between client and server, but the question requires data in transit between the database and client, which is typically handled by TLS (enforced by the server). Option D is wrong because dynamic data masking does not encrypt data. Option E is wrong because Microsoft Defender for SQL provides threat detection, not encryption or backup.
What should I do if I get this DP-300 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-300 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
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Last reviewed: Jun 21, 2026
This DP-300 practice question is part of Courseiva's free Microsoft 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 DP-300 exam.
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