The most likely cause is that the Microsoft Defender for Endpoint sensor is not connected to the cloud service. Even when the local Defender service appears to be running, the sensor requires an active HTTPS connection using TLS 1.2 or higher to communicate with the Microsoft Defender XDR backend. Without this cloud connectivity, the device cannot send telemetry or receive policy updates, so the console marks it as 'inactive' despite the service running locally. On the MD-102 exam, this question tests your understanding that 'inactive' is a connectivity status, not a service status—a common trap is assuming the service itself is the issue. Remember: a running engine doesn't mean the car is on the road; the sensor must be "on the road" to the cloud. A useful memory tip is "Service runs, sensor phones home"—if the phone line is dead, the device goes inactive.
MD-102 Prepare infrastructure for devices Practice Question
This MD-102 practice question tests your understanding of prepare infrastructure for devices. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 organization uses Microsoft Defender for Endpoint to manage device security. You need to ensure that all Windows devices are reporting security events to Microsoft Defender XDR. You have verified that the Microsoft Defender for Endpoint service is running on the devices. However, some devices show as 'inactive' in the Microsoft Defender XDR console. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Microsoft Defender for Endpoint sensor is not connected to the cloud service.
The 'inactive' status in Microsoft Defender XDR indicates that the Defender for Endpoint sensor on the device has lost connectivity to the cloud service. Even if the service is running locally, the sensor must maintain an active HTTPS connection (using TLS 1.2 or higher) to the Defender for Endpoint backend to send telemetry and receive policy updates. Without this cloud connectivity, the device cannot report security events, resulting in the 'inactive' state.
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.
✗
The device is not compliant with Intune compliance policies.
Why it's wrong here
Compliance is independent of Defender sensor connectivity.
✗
The device is not enrolled in Microsoft Intune.
Why it's wrong here
Defender for Endpoint can work without Intune enrollment.
✗
The device does not have Microsoft Defender Antivirus enabled.
Why it's wrong here
Antivirus is a separate component; the sensor can still report without it.
✓
The Microsoft Defender for Endpoint sensor is not connected to the cloud service.
Why this is correct
Inactive status typically indicates a communication issue between the sensor and the cloud.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume a running service equals full functionality, but the exam tests the distinction between the local service state and the cloud connectivity required for the sensor to report as 'active' in the console.
Detailed technical explanation
How to think about this question
The Defender for Endpoint sensor uses the Windows service 'Sense' (MsSense.exe) to collect and upload telemetry. Connectivity relies on outbound HTTPS to specific URLs (e.g., *.endpoint.microsoft.com) and requires valid certificates for authentication. A common subtle issue is that proxy or firewall rules may block the required endpoints while the local service appears running, causing the device to show as 'inactive' despite no visible errors. In real-world scenarios, misconfigured SSL inspection or outdated root certificates can silently break the sensor's cloud connection.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MD-102 question in full detail.
Prepare infrastructure for devices — This question tests Prepare infrastructure for devices — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Microsoft Defender for Endpoint sensor is not connected to the cloud service. — The 'inactive' status in Microsoft Defender XDR indicates that the Defender for Endpoint sensor on the device has lost connectivity to the cloud service. Even if the service is running locally, the sensor must maintain an active HTTPS connection (using TLS 1.2 or higher) to the Defender for Endpoint backend to send telemetry and receive policy updates. Without this cloud connectivity, the device cannot report security events, resulting in the 'inactive' state.
What should I do if I get this MD-102 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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