SC-200 Respond to security incidents Practice Question
Which TWO response actions are available in Microsoft Defender for Endpoint for a compromised device? (Choose two.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Run a full antivirus scan
Options B and D are correct because Microsoft Defender for Endpoint includes predefined response actions such as running a full antivirus scan and isolating a device from the network. Option A is incorrect because disabling the user account is an identity mitigation action in Microsoft Entra ID, not a device response in Defender for Endpoint. Option C is incorrect because changing Windows Firewall rules is not a standard response action in Defender for Endpoint. Option E is incorrect because resetting a device to factory defaults is not a supported response action.
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 user account
Why it's wrong here
Disabling a user account is a Microsoft Entra ID identity action, not a Defender for Endpoint device response. It tempts because containing compromised credentials is a valid incident step, but Defender for Endpoint offers device actions such as isolating the device, running antivirus scans and restricting app execution.
- ✓
Run a full antivirus scan
Why this is correct
A full antivirus scan is an available device response action in Microsoft Defender for Endpoint, running alongside quick scan to detect and remediate malware on the compromised endpoint. It supports containment and eradication without isolating the device or requiring manual intervention.
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Change the Windows Firewall rules
Why it's wrong here
Defender for Endpoint's device response actions cover isolation, live response, antivirus scans, app restriction and investigation packages; firewall rule editing sits in Intune endpoint security profiles, not the portal's action pane. It tempts because firewall policy genuinely contains threats, but that is configuration management, not incident response.
- ✓
Isolate the device from the network
Why this is correct
Isolation severs the device's network connections while preserving the Defender for Endpoint channel, containing lateral movement and exfiltration without wiping evidence. This directly satisfies the scenario's containment requirement, letting analysts investigate remotely and later release the device once remediation completes.
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Reset the device to factory defaults
Why it's wrong here
Factory reset is an Intune or Autopilot remote wipe capability, not a Defender for Endpoint response action; the portal offers only isolation, live response, scan, app restriction and investigation package collection. It tempts as the ultimate remediation, yet wiping destroys forensic evidence and suits device reprovisioning, not containment.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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