The answer is to disable the user account in Microsoft Entra ID. This is the correct first step because it immediately revokes all authentication tokens and prevents any new sign-ins, stopping the compromised account from sending phishing emails or accessing resources, while preserving forensic data like mailbox logs and session history. On the SC-900 exam, this scenario tests your understanding of incident response priorities—specifically that containment must come before remediation, and that disabling an account is faster and more definitive than resetting a password or revoking sessions, which may leave active tokens valid. A common trap is choosing password reset, but remember that tokens persist until they expire. For a memory tip, think “Disable first, investigate second” or use the mnemonic D.I.R.T. (Disable, Isolate, Reset, Trace) to recall the containment order.
SC-900 Practice Question: Describe the capabilities of Microsoft security solutions
This SC-900 practice question tests your understanding of describe the capabilities of microsoft security solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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, Contoso Ltd., uses Microsoft 365 and Microsoft Defender XDR. You are a security administrator. Recently, a user named John Doe reported that his account is sending phishing emails internally. You suspect his account is compromised. You need to contain the threat immediately while preserving forensic data. The company has the following security solutions: Microsoft Entra ID P2, Microsoft Defender for Office 365, Microsoft Defender for Endpoint, Microsoft Sentinel, and Microsoft Purview. You need to prevent the compromised account from causing further damage. Which action should you take 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.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Disable the user account in Microsoft Entra ID
Option A is correct because disabling the user account in Microsoft Entra ID is the quickest way to stop the compromised account from sending emails. Option B is wrong because resetting password does not immediately revoke active sessions; tokens may still be valid. Option C is wrong while useful, revoking sessions is not as immediate as disabling the account; also, disabling the account is a stronger containment step. Option D is wrong because creating a mail flow rule takes time and may not stop the account if it's already authenticated.
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.
✗
Reset the user's password and require a password change
Why it's wrong here
Resetting password may not revoke existing tokens immediately.
✗
Revoke all refresh tokens for the user in Microsoft Entra ID
Why it's wrong here
Revoking tokens is good but disabling the account is more comprehensive.
✓
Disable the user account in Microsoft Entra ID
Why this is correct
Disabling immediately blocks all authentication and access.
Clue confirmation
The clue words "first", "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a mail flow rule in Exchange Online to block the user's emails
Why it's wrong here
Mail flow rule may not block all traffic if the account is already authenticated.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 SC-900 question in full detail.
Identify which SC-900 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Describe the capabilities of Microsoft security solutions — This question tests Describe the capabilities of Microsoft security solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Disable the user account in Microsoft Entra ID — Option A is correct because disabling the user account in Microsoft Entra ID is the quickest way to stop the compromised account from sending emails. Option B is wrong because resetting password does not immediately revoke active sessions; tokens may still be valid. Option C is wrong while useful, revoking sessions is not as immediate as disabling the account; also, disabling the account is a stronger containment step. Option D is wrong because creating a mail flow rule takes time and may not stop the account if it's already authenticated.
What should I do if I get this SC-900 question wrong?
Identify which SC-900 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "first", "immediately / without restart". 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.
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