The correct action is to remove the firewall rule that allows the VPN gateway IP address. This immediately stops the SQL injection attack because the Azure SQL Database firewall operates at the network layer, and the attacker is exploiting the specific rule permitting that VPN gateway IP as their sole entry point. By deleting only that rule, you block the malicious traffic while preserving legitimate access through other firewall rules, such as those for on-premises ranges or other VPNs. On the Microsoft Azure Database Administrator Associate DP-300 exam, this scenario tests your understanding of network security controls versus application-layer defenses—a common trap is to suggest enabling Microsoft Defender for Cloud or adjusting SQL authentication, but the firewall is the fastest kill switch here. Remember the memory tip: “Block the door, not the window”—remove the specific IP rule allowing the breach rather than disabling broader protections.
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.
Your company uses Azure SQL Database with Microsoft Defender for Cloud. You receive an alert indicating a potential SQL injection attack. The alert shows that the attack originated from the IP address of your company's VPN gateway. You have verified that no legitimate users are using the VPN at that time. What should you do to immediately stop the attack while preserving legitimate access?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Remove the firewall rule that allows the VPN gateway IP address
Option C is correct because the attack is originating from the VPNgateway's IP address, and the firewall rule allowing that IP is the only entry point for the attacker. By removing that specific firewall rule, you immediately block the malicious traffic while preserving legitimate access through other firewall rules (e.g., for on-premises or other VPN ranges). This directly stops the SQL injection attack at the network layer without affecting other users or services.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Disable the public endpoint on the SQL Database
Why it's wrong here
This would block all public access, including legitimate users.
✗
Change the SQL Database server admin password
Why it's wrong here
The attack is via SQL injection, not compromised credentials.
✓
Remove the firewall rule that allows the VPN gateway IP address
Why this is correct
This will block the attacker while allowing other legitimate IPs.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add the attacker's IP address to a block list in Microsoft Defender for Cloud
Why it's wrong here
Microsoft Defender for Cloud does not have a block list for SQL Database firewall.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think changing the admin password or disabling the public endpoint is the fastest fix, but the question specifically asks to 'immediately stop the attack while preserving legitimate access,' which requires a targeted network-level block rather than a broad or authentication-based change.
Detailed technical explanation
How to think about this question
Azure SQL Database firewall rules are evaluated at the gateway level before any connection reaches the database engine; removing the rule for the VPN gateway IP immediately terminates all active connections from that IP. SQL injection attacks typically exploit input validation flaws in the application layer, but the network-level block prevents the attacker from sending further malicious queries. In a real-world scenario, the attacker might be using the VPN gateway as a proxy, so removing the rule stops the attack while you investigate the application code for the injection vulnerability.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Implement a secure environment — This question tests Implement a secure environment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Remove the firewall rule that allows the VPN gateway IP address — Option C is correct because the attack is originating from the VPN gateway's IP address, and the firewall rule allowing that IP is the only entry point for the attacker. By removing that specific firewall rule, you immediately block the malicious traffic while preserving legitimate access through other firewall rules (e.g., for on-premises or other VPN ranges). This directly stops the SQL injection attack at the network layer without affecting other users or services.
What should I do if I get this DP-300 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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