- A
Transparent Data Encryption (TDE): Encrypts data at rest
TDE encrypts the database files on disk, protecting data at rest.
- B
Always Encrypted: Encrypts data in use on client side
Always Encrypted encrypts sensitive data on the client side and never reveals the encryption keys to the database engine.
- C
Dynamic Data Masking: Masks sensitive data in query results
Dynamic Data Masking obfuscates sensitive data in query results for non-privileged users.
- D
Transparent Data Encryption (TDE): Encrypts data in use on client side
Why wrong: Incorrect — TDE encrypts data at rest, not in use. This definition describes Always Encrypted.
- E
Always Encrypted: Encrypts data at rest
Why wrong: Incorrect — Always Encrypted encrypts data in use on the client side, not at rest. This definition describes TDE.
DP-300 Practice Question: Plan and configure high availability and disaster recovery
This DP-300 practice question tests your understanding of plan and configure high availability and disaster recovery. 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.
Match each Azure SQL Database security feature to its purpose.
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
Transparent Data Encryption (TDE): Encrypts data at rest
TDE protects data at rest by encrypting the database files. Always Encrypted protects data in use by encrypting on the client side. Dynamic Data Masking hides sensitive data in query results from unauthorized users. Common confusions involve mixing up TDE and Always Encrypted.
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.
- ✓
Transparent Data Encryption (TDE): Encrypts data at rest
- ✓
Always Encrypted: Encrypts data in use on client side
Why this is correct
Always Encrypted encrypts sensitive data on the client side and never reveals the encryption keys to the database engine.
Related concept
CIDR notation defines the prefix length.
- ✓
Dynamic Data Masking: Masks sensitive data in query results
Why this is correct
Dynamic Data Masking obfuscates sensitive data in query results for non-privileged users.
Related concept
CIDR notation defines the prefix length.
- ✗
Transparent Data Encryption (TDE): Encrypts data in use on client side
Why it's wrong here
Incorrect — TDE encrypts data at rest, not in use. This definition describes Always Encrypted.
- ✗
Always Encrypted: Encrypts data at rest
Why it's wrong here
Incorrect — Always Encrypted encrypts data in use on the client side, not at rest. This definition describes TDE.
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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Plan and configure high availability and disaster recovery — study guide chapter
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FAQ
Questions learners often ask
What does this DP-300 question test?
Plan and configure high availability and disaster recovery — This question tests Plan and configure high availability and disaster recovery — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Transparent Data Encryption (TDE): Encrypts data at rest — TDE protects data at rest by encrypting the database files. Always Encrypted protects data in use by encrypting on the client side. Dynamic Data Masking hides sensitive data in query results from unauthorized users. Common confusions involve mixing up TDE and Always Encrypted.
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.
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Last reviewed: Jun 11, 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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