The answer is to create a custom indicator (IOC) for the IP address in Microsoft Defender for Endpoint. This works because Defender for Endpoint’s custom indicators enforce a block at the network level directly on every onboarded device, using the Microsoft Defender Antivirus network protection feature to intercept and drop traffic to that IP before it reaches the application layer. On the SC-200 exam, this tests your understanding of how Defender for Endpoint handles threat intelligence and remediation actions, often appearing in incident response scenarios where you must distinguish between blocking at the endpoint versus blocking at the firewall or SIEM level. A common trap is confusing Microsoft Sentinel’s indicators with Defender for Endpoint’s—Sentinel blocks log ingestion, not network traffic. Remember: to block an attacker IP across all devices, think “endpoint indicator, not cloud log collector.” A useful memory tip is “IOC blocks the flow, Sentinel just says no.”
SC-200 Respond to security incidents Practice Question
This SC-200 practice question tests your understanding of respond to security incidents. 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.
During an incident response, a security engineer needs to block an attacker's IP address at the network level for all devices in the organization. The organization uses Microsoft Defender for Endpoint and Microsoft Intune for device management. What is the most efficient way to achieve this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a custom indicator (IOC) for the IP address in Microsoft Defender for Endpoint
Option A is correct because a custom indicator in Defender for Endpoint blocks the IP across all onboarded devices. Option B is wrong because blocking in Microsoft Sentinel only affects log ingestion, not network traffic. Option C is wrong because Intune policies are for configuration, not real-time blocking. Option D is wrong because Azure Firewall would need to be in the network path and is a separate product.
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.
✗
Add the IP address to a blocklist in Microsoft Sentinel
Why it's wrong here
Sentinel blocklists are for log sources, not network traffic.
✗
Create a device configuration policy in Microsoft Intune to block the IP
Why it's wrong here
Intune policies are not designed for real-time IP blocking.
✗
Configure Azure Firewall to block the IP
Why it's wrong here
Azure Firewall is not the most efficient as it requires routing traffic through it.
✓
Create a custom indicator (IOC) for the IP address in Microsoft Defender for Endpoint
Why this is correct
Custom indicators block IPs across all Defender for Endpoint devices.
Related concept
Static NAT maps one inside address to one outside address.
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 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 SC-200 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 SC-200 NAT questions on configuration and troubleshooting.
Respond to security incidents — This question tests Respond to security incidents — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Create a custom indicator (IOC) for the IP address in Microsoft Defender for Endpoint — Option A is correct because a custom indicator in Defender for Endpoint blocks the IP across all onboarded devices. Option B is wrong because blocking in Microsoft Sentinel only affects log ingestion, not network traffic. Option C is wrong because Intune policies are for configuration, not real-time blocking. Option D is wrong because Azure Firewall would need to be in the network path and is a separate product.
What should I do if I get this SC-200 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 SC-200 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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