The answer is to block the malicious domain on the firewall. This action immediately prevents lateral movement by cutting off any further communication between the compromised host and the attacker’s command-and-control infrastructure, even if the initial phishing link click did not trigger observable malicious activity. In the context of the Microsoft Security Operations Analyst SC-200 exam, this question tests your understanding of containment versus remediation: blocking the domain is a network-level containment step that stops the attack from spreading, whereas disabling the user account or resetting passwords are post-compromise steps that assume a confirmed breach. A common trap is to jump to user-focused actions, but the key is that no compromise has been confirmed yet—only a link click. Remember the memory tip: “Block first, ask questions later” when dealing with an unconfirmed phishing click, because the firewall is your fastest barrier against lateral movement.
SC-200 Respond to security incidents Practice Question
This SC-200 practice question tests your understanding of respond to security incidents. 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.
You are investigating a security incident in Microsoft Sentinel where a user received a phishing email containing a link to a malicious domain. The link was clicked, but no further actions were observed. Which playbook action should you take immediately to prevent potential lateral movement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
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
✓
Block the malicious domain on the firewall
The correct action is to block the malicious domain at the firewall or proxy to prevent further access. Disabling the user account might be premature if no compromise is confirmed. Resetting password and revoking sessions are post-compromise steps. Blocking the domain is immediate containment.
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.
✗
Disable the user's account
Why it's wrong here
The user clicked a link but no compromise is confirmed; disabling is too aggressive without evidence.
✗
Revoke the user's active sessions
Why it's wrong here
Revoking sessions is for token theft; not indicated here.
✗
Reset the user's password
Why it's wrong here
Password reset is for confirmed credential compromise; here only a link was clicked.
✓
Block the malicious domain on the firewall
Why this is correct
Blocking the domain prevents further access to the malicious site, containing the threat.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
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 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 SC-200 question in full detail.
Identify which SC-200 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.
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: Block the malicious domain on the firewall — The correct action is to block the malicious domain at the firewall or proxy to prevent further access. Disabling the user account might be premature if no compromise is confirmed. Resetting password and revoking sessions are post-compromise steps. Blocking the domain is immediate containment.
What should I do if I get this SC-200 question wrong?
Identify which SC-200 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: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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