- A
Delete the suspicious sent messages and close the ticket.
Why wrong: Removing messages does not stop the attacker from continuing to use the account, and it can destroy useful evidence.
- B
Revoke the account's active sessions and reset the password immediately.
Ending active sessions cuts off any stolen cookies or tokens that may still be valid, and resetting the password prevents immediate reentry. In an email compromise, the attacker often keeps access through browser sessions even after credentials change. Fast containment should focus on terminating current access paths first, then investigating forwarding rules, OAuth grants, and sign-in history.
- C
Wait until the end of the workday to avoid interrupting the user.
Why wrong: Delaying containment gives the attacker more time to exfiltrate data, send phishing messages, or change account settings.
- D
Reimage the user's laptop before touching the email account.
Why wrong: A reimage may be useful later if endpoint compromise is confirmed, but it does not immediately stop mailbox misuse.
SY0-701 Security Operations Practice Question
This SY0-701 practice question tests your understanding of security operations. 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.
A help desk ticket reports that a user's Microsoft 365 mailbox sent hundreds of messages to external contacts, and the user says they are still receiving MFA prompts they did not start. The attacker may still have an active web session. What is the best first containment action?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Revoke the account's active sessions and reset the password immediately.
Option B is correct because the user is still receiving unsolicited MFA prompts, indicating an attacker likely has an active web session with a valid token. Revoking all active sessions immediately invalidates any existing tokens or cookies, while resetting the password ensures the attacker cannot re-authenticate. This is the fastest way to cut off the attacker's access and stop further abuse of the mailbox.
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.
- ✗
Delete the suspicious sent messages and close the ticket.
Why it's wrong here
Removing messages does not stop the attacker from continuing to use the account, and it can destroy useful evidence.
- ✓
Revoke the account's active sessions and reset the password immediately.
Why this is correct
Ending active sessions cuts off any stolen cookies or tokens that may still be valid, and resetting the password prevents immediate reentry. In an email compromise, the attacker often keeps access through browser sessions even after credentials change. Fast containment should focus on terminating current access paths first, then investigating forwarding rules, OAuth grants, and sign-in history.
Clue confirmation
The clue words "best", "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Wait until the end of the workday to avoid interrupting the user.
Why it's wrong here
Delaying containment gives the attacker more time to exfiltrate data, send phishing messages, or change account settings.
- ✗
Reimage the user's laptop before touching the email account.
Why it's wrong here
A reimage may be useful later if endpoint compromise is confirmed, but it does not immediately stop mailbox misuse.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think deleting the sent messages is sufficient containment, failing to recognize that the attacker's active session must be terminated to stop ongoing compromise.
Detailed technical explanation
How to think about this question
In Microsoft 365, active sessions are maintained via OAuth 2.0 refresh tokens and session cookies. Revoking sessions via the Azure AD portal or using the `Revoke-AzureADUserAllRefreshToken` PowerShell cmdlet invalidates all tokens issued to the user, forcing re-authentication. This is critical because an attacker with a valid refresh token can silently obtain new access tokens without needing the password, bypassing MFA prompts entirely.
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 SOC analyst notices unusual lateral movement in the network at 2 AM. The IR playbook dictates: identify and contain (isolate the affected machine), then eradicate (remove the malware), then recover (restore from backup), then document. Skipping containment before eradication risks the attacker regaining access. Questions like this test the sequence and rationale of incident response phases.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this SY0-701 question test?
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Revoke the account's active sessions and reset the password immediately. — Option B is correct because the user is still receiving unsolicited MFA prompts, indicating an attacker likely has an active web session with a valid token. Revoking all active sessions immediately invalidates any existing tokens or cookies, while resetting the password ensures the attacker cannot re-authenticate. This is the fastest way to cut off the attacker's access and stop further abuse of the mailbox.
What should I do if I get this SY0-701 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: "best", "first". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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