The answer is enforcing TLS 1.2 and using an Azure VPN gateway. These two methods are valid because they encrypt data as it travels between clients and Azure SQL Database, directly addressing the need to secure data in transit. TLS 1.2 ensures encrypted communication over the internet, while an Azure VPN gateway creates an encrypted tunnel through a virtual network, protecting traffic from interception. On the DP-300 exam, this question tests your ability to distinguish between encryption layers: Always Encrypted protects data at rest or in use, not in transit, and network security groups or Azure Firewall handle access control, not encryption. A common trap is confusing column-level encryption with transport security. Remember the mnemonic “TLS and VPN, the transit twins” to recall that only these two directly encrypt data moving across the network.
DP-300 Implement a secure environment Practice Question
This DP-300 practice question tests your understanding of implement a secure environment. 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 of the following are valid methods to secure data in transit for Azure SQL Database?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the server to enforce TLS 1.2 by setting minimal TLS version.
Enforcing TLS 1.2 and using an Azure VPNgateway are valid methods to secure data in transit. Column-level encryption (Always Encrypted) protects data in use, not in transit. Network security groups (NSGs) are for network layer filtering, not encryption. Azure Firewall is a network security service, not specifically for data in transit 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.
✗
Enable Always Encrypted on sensitive columns.
Why it's wrong here
Always Encrypted is for data in use, not in transit.
✗
Deploy Azure Firewall in front of the database.
Why it's wrong here
Azure Firewall provides network security but not encryption in transit.
✓
Configure the server to enforce TLS 1.2 by setting minimal TLS version.
Apply a Network Security Group (NSG) to the subnet.
Why it's wrong here
NSGs filter traffic but do not encrypt.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-300 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-300 subnetting questions on CIDR, address ranges, and subnet selection.
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: Configure the server to enforce TLS 1.2 by setting minimal TLS version. — Enforcing TLS 1.2 and using an Azure VPN gateway are valid methods to secure data in transit. Column-level encryption (Always Encrypted) protects data in use, not in transit. Network security groups (NSGs) are for network layer filtering, not encryption. Azure Firewall is a network security service, not specifically for data in transit encryption.
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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Question Discussion
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