- A
Report the phishing site to Microsoft.
Why wrong: Reporting helps others but does not address the immediate incident.
- B
Block the phishing URL in Microsoft Defender for Office 365.
Why wrong: Blocking the URL prevents future clicks but does not contain the current compromise.
- C
Reset the user's password and revoke sessions.
This invalidates the stolen credentials and existing sessions.
- D
Delete the phishing email from the user's mailbox.
Why wrong: Deleting the email does not invalidate the stolen credentials.
Question 1,006 of 1,639
SC-200 Respond to security incidents Practice Question
This SC-200 practice question tests your understanding of respond to security incidents. 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.
You are responding to a phishing incident. The investigation reveals that a user clicked a link in a phishing email and entered credentials on a fake site. You need to contain the incident and prevent further compromise. What should you do first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
✓
Reset the user's password and revoke sessions.
Option C is correct because the immediate priority when credentials have been compromised is to invalidate them, preventing the attacker from using them for further access. Resetting the password and revoking sessions (e.g., via Azure AD 'Revoke-AzureADUserAllRefreshToken' or 'Revoke-MgUserSignInSession') ensures the attacker cannot authenticate again, even if they have the password hash or active tokens. This aligns with the NIST SP 800-61 incident response containment phase.
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.
- ✗
Report the phishing site to Microsoft.
Why it's wrong here
Reporting helps others but does not address the immediate incident.
- ✗
Block the phishing URL in Microsoft Defender for Office 365.
Why it's wrong here
Blocking the URL prevents future clicks but does not contain the current compromise.
- ✓
Reset the user's password and revoke sessions.
Why this is correct
This invalidates the stolen credentials and existing sessions.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Delete the phishing email from the user's mailbox.
Why it's wrong here
Deleting the email does not invalidate the stolen credentials.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates focus on blocking the phishing URL or deleting the email (technical controls for the attack vector) instead of recognizing that the core containment priority is neutralizing the compromised credentials (the attacker's foothold).
Detailed technical explanation
How to think about this question
When a user enters credentials on a fake site, the attacker can immediately use those credentials to authenticate via protocols like OAuth 2.0 or SAML, obtaining refresh tokens that remain valid until revoked. Revoking sessions via the Microsoft Graph API (e.g., `revokeSignInSessions`) invalidates all issued tokens, including refresh and access tokens, forcing re-authentication. In a real-world scenario, an attacker might use stolen credentials to set up mailbox forwarding rules or perform lateral movement within minutes, so password reset and session revocation must occur before any other containment action.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Respond to security incidents — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this SC-200 question test?
Respond to security incidents — This question tests Respond to security incidents — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Reset the user's password and revoke sessions. — Option C is correct because the immediate priority when credentials have been compromised is to invalidate them, preventing the attacker from using them for further access. Resetting the password and revoking sessions (e.g., via Azure AD 'Revoke-AzureADUserAllRefreshToken' or 'Revoke-MgUserSignInSession') ensures the attacker cannot authenticate again, even if they have the password hash or active tokens. This aligns with the NIST SP 800-61 incident response containment phase.
What should I do if I get this SC-200 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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
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