Quick Answer
The correct answer is to create an automation rule in Sentinel that runs a playbook to add a deny NSG rule. This is the most efficient approach because Sentinel automation rules can trigger a playbook—typically a Logic App—that programmatically modifies an Azure Network Security Group to block the attacker’s IP address for a defined duration, such as 24 hours, without any manual intervention. On the AZ-500 exam, this scenario tests your understanding of how Sentinel’s automation and playbook capabilities integrate with Azure networking to provide real-time threat response, often contrasting with less suitable options like manual NSG rules, Azure Policy (which is for compliance, not real-time blocking), or JIT access (which controls VM access but doesn’t block specific IPs). A common trap is choosing a manual rule because it seems simpler, but the question explicitly requires automation. Remember the mnemonic “SNAP” for Sentinel’s automated NSG blocking: Sentinel triggers, NSG rule, Automation rule, Playbook.
This AZ-500 practice question tests your understanding of secure azure using microsoft defender for cloud and microsoft sentinel. 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.
A security analyst receives a high-severity alert in Microsoft Sentinel indicating a potential brute-force attack against an Azure VM. The analyst wants to automatically block the attacker IP for 24 hours. What is the most efficient way to achieve this?
Create an automation rule in Sentinel that runs a playbook to add a deny NSG rule.
Correct: automated response via playbook.
Enable Just-in-Time VM access to restrict all RDP traffic.
Why wrong: Does not block specific IP.
Create an Azure Policy to deny all traffic from the attacker IP.
Why wrong: Policy is not real-time blocking.
Manually add a deny rule to the NSG attached to the VM's subnet.
Why wrong: Manual, not automated.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Create an automation rule in Sentinel that runs a playbook to add a deny NSG rule.
Option D is correct because Sentinel automation rules can trigger a playbook that runs a script to add a network security group (NSG) rule to deny the IP. Option A (manual NSG rule) is not automatic. Option B (Azure Policy) is not designed for real-time blocking. Option C (JIT access) controls access, not blocking specific IPs.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Create an automation rule in Sentinel that runs a playbook to add a deny NSG rule.
Why this is correct
Correct: automated response via playbook.
Related concept
CIDR notation defines the prefix length.
Enable Just-in-Time VM access to restrict all RDP traffic.
Why it's wrong here
Does not block specific IP.
Create an Azure Policy to deny all traffic from the attacker IP.
Why it's wrong here
Policy is not real-time blocking.
Manually add a deny rule to the NSG attached to the VM's subnet.
Why it's wrong here
Manual, not automated.
Common exam traps
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
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.
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
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.
What to study next
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AZ-500 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Secure Azure using Microsoft Defender for Cloud and Microsoft Sentinel — This question tests Secure Azure using Microsoft Defender for Cloud and Microsoft Sentinel — CIDR notation defines the prefix length..
The correct answer is: Create an automation rule in Sentinel that runs a playbook to add a deny NSG rule. — Option D is correct because Sentinel automation rules can trigger a playbook that runs a script to add a network security group (NSG) rule to deny the IP. Option A (manual NSG rule) is not automatic. Option B (Azure Policy) is not designed for real-time blocking. Option C (JIT access) controls access, not blocking specific IPs.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AZ-500 subnetting questions on CIDR, address ranges, and subnet selection.
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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