The correct answer is to set the 'Minimal TLS Version' property to 1.2 and set 'Public data endpoint' to 'Disabled'. This configuration directly enforces encrypted connections by rejecting any client that attempts to connect with a protocol lower than TLS 1.2, while the disabled public endpoint eliminates all internet-facing traffic, forcing connections through a private network path. On the DP-300 exam, this scenario tests your understanding of Azure SQL Managed Instance’s dual-layer security controls: one for encryption enforcement and one for network isolation. A common trap is confusing a server-level firewall rule or a private endpoint alone with TLS enforcement—firewall rules control IP access but do not mandate encryption, and private endpoints restrict network routing but do not dictate the TLS version. Remember the pairing: TLS version controls the encryption floor, and the public endpoint toggle controls the network surface. A useful memory tip is "TLS for the handshake, public off for the attack."
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 multinational corporation that uses Azure SQL Managed Instance to host multiple databases for different business units. The security policy requires that all connections to the managed instance must use encrypted connections (TLS 1.2 or higher). Additionally, the company wants to minimize the attack surface by restricting network access. You need to configure the managed instance to enforce encrypted connections and block all public internet traffic. What should you do?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set the 'Minimal TLS Version' property to 1.2 and set 'Public data endpoint' to 'Disabled'
Option B is correct because setting the 'Minimal TLS Version' property to 1.2 enforces that only connections using TLS 1.2 or higher are accepted. Setting 'Public data endpoint' to 'Disabled' blocks all public internet traffic. Option A is wrong because disabling the public endpoint and enabling a service endpoint does not enforce TLS. Option C is wrong because a server-level firewall rule does not enforce TLS encryption. Option D is wrong because enabling a private endpoint alone does not enforce TLS settings.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Set the 'Minimal TLS Version' property to 1.2 and set 'Public data endpoint' to 'Disabled'
Why this is correct
This enforces TLS 1.2 or higher and blocks public internet traffic.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Enable a private endpoint and set the 'Minimal TLS Version' property to 1.0
Why it's wrong here
TLS 1.0 is not secure and does not meet the requirement for TLS 1.2 or higher.
✗
Disable the public endpoint and enable a service endpoint for the virtual network
Why it's wrong here
Service endpoints provide connectivity but do not enforce TLS encryption.
✗
Configure a server-level firewall rule to allow only specific IP addresses and set the 'Minimal TLS Version' property to 1.2
Why it's wrong here
Firewall rules control which IPs can connect, but the public endpoint remains enabled, increasing the attack surface.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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-300 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DP-300 NAT questions on configuration and troubleshooting.
Implement a secure environment — This question tests Implement a secure environment — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Set the 'Minimal TLS Version' property to 1.2 and set 'Public data endpoint' to 'Disabled' — Option B is correct because setting the 'Minimal TLS Version' property to 1.2 enforces that only connections using TLS 1.2 or higher are accepted. Setting 'Public data endpoint' to 'Disabled' blocks all public internet traffic. Option A is wrong because disabling the public endpoint and enabling a service endpoint does not enforce TLS. Option C is wrong because a server-level firewall rule does not enforce TLS encryption. Option D is wrong because enabling a private endpoint alone does not enforce TLS settings.
What should I do if I get this DP-300 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DP-300 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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