The most likely cause is that the Microsoft Defender for Endpoint sensor is not installed or configured correctly on the affected Windows 10 devices. This sensor is the critical agent responsible for collecting and relaying security telemetry to the Defender for Endpoint cloud service; without it, the device cannot report its health status, resulting in an inactive state in the Microsoft 365 Defender portal even if the device is online and otherwise functional. On the MD-102 exam, this scenario tests your understanding of the sensor’s role as the foundational component for device onboarding and health reporting, often appearing as a trap where candidates mistakenly blame network connectivity or firewall settings. A common memory tip is to think of the sensor as the device’s “voice” to the cloud—if it’s missing or misconfigured, the device is effectively mute, regardless of its physical health. Remember: no sensor, no signal.
MD-102 Manage and maintain devices Practice Question
This MD-102 practice question tests your understanding of manage and maintain devices. 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.
Your organization uses Microsoft Defender for Endpoint (Microsoft Defender XDR). You need to ensure that all Windows 10 devices report their security health to Microsoft Defender for Endpoint. Some devices are showing as inactive. 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 installed or configured correctly.
The Microsoft Defender for Endpoint sensor is the core component that collects and reports security telemetry from Windows 10 devices to the Defender for Endpoint cloud service. If the sensor is not installed, is missing, or is misconfigured (e.g., due to a corrupted installation or incorrect onboarding script), the device will appear as inactive in the Microsoft 365 Defender portal, even if the device is otherwise healthy and connected.
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 devices are not enrolled in Microsoft Intune.
Why it's wrong here
Devices can be managed by Defender for Endpoint without Intune enrollment.
✓
The Microsoft Defender for Endpoint sensor is not installed or configured correctly.
Why this is correct
The sensor must be onboarded to communicate with the Defender for Endpoint service.
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.
✗
The devices are not compliant with conditional access policies.
Why it's wrong here
Noncompliance does not prevent reporting to Defender for Endpoint.
✗
The devices have lost connectivity to the internet.
Why it's wrong here
Connectivity loss would cause more than just inactivity in Defender.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse device enrollment (Intune) with sensor onboarding, assuming that a device must be managed by Intune to report to Defender for Endpoint, when in fact any Windows 10 device can be onboarded via a simple script or GPO.
Detailed technical explanation
How to think about this question
The Defender for Endpoint sensor (MsSense.exe) communicates with the cloud backend using HTTPS on port 443, and its health is monitored via the 'MachineInactive' alert in the portal. A device is marked inactive if it has not reported telemetry for more than 7 days, which commonly occurs when the sensor service is stopped, the onboarding script (e.g., WindowsDefenderATPOnboardingScript.cmd) was not executed, or the sensor registration key under HKLM\SOFTWARE\Microsoft\Windows Advanced Threat Protection\Status is missing or invalid.
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 MD-102 question in full detail.
Manage and maintain devices — This question tests Manage and maintain 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 installed or configured correctly. — The Microsoft Defender for Endpoint sensor is the core component that collects and reports security telemetry from Windows 10 devices to the Defender for Endpoint cloud service. If the sensor is not installed, is missing, or is misconfigured (e.g., due to a corrupted installation or incorrect onboarding script), the device will appear as inactive in the Microsoft 365 Defender portal, even if the device is otherwise healthy and connected.
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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