The correct answer is to configure spoof intelligence settings to block the spoofed domain. Spoof intelligence in Microsoft Defender for Office 365 is a dedicated anti-spoofing feature that automatically analyzes sender behavior and domain authentication results; when you explicitly block a domain via these settings, you override any false-positive allowances and force the system to quarantine or reject messages that impersonate your own domain. On the MS-102 exam, this question tests your ability to distinguish between email authentication mechanisms—while DKIM and DMARC are critical for verifying message integrity, spoof intelligence provides the most direct and immediate control over spoofed internal domains, and a common trap is confusing DMARC policy (which requires DNS configuration) with the simpler, tenant-level spoof intelligence toggle. Remember the memory tip: "Spoof intelligence is the bouncer at the door; DMARC is the security camera after the fact."
MS-102 Practice Question: Manage security and threats by using Microsoft Defender XDR
This MS-102 practice question tests your understanding of manage security and threats by using microsoft defender xdr. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 uses Microsoft Defender for Office 365. You receive a report that users are receiving spoofed email messages that appear to come from your own domain. The spoofed messages are not being filtered. You need to ensure that spoofed messages from your domain are blocked. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure spoof intelligence settings to block the spoofed domain
Option B is correct because spoof intelligence in Microsoft Defender for Office 365 allows you to block spoofed messages from your own domain. Option A is wrong because DKIM signing is important but does not block spoofed messages by itself. Option C is wrong because DMARC policy can help but spoof intelligence is more direct. Option D is wrong because adding domain to allowed list would actually allow spoofing.
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.
✗
Add your domain to the allowed domains list in the anti-spam policy
Why it's wrong here
This would actually allow more spoofed messages.
✓
Configure spoof intelligence settings to block the spoofed domain
Read the scenario before looking for a memorised answer.
✗
Configure DKIM signing for your domain
Why it's wrong here
DKIM helps validate message integrity but does not block spoofing directly.
✗
Configure DMARC policy to reject messages that fail SPF or DKIM
Why it's wrong here
DMARC is useful but spoof intelligence is more specific for this scenario.
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.
Trap categories for this question
Scenario analysis trap
DMARC is useful but spoof intelligence is more specific for this scenario.
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 MS-102 question in full detail.
Identify which MS-102 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.
Manage security and threats by using Microsoft Defender XDR — This question tests Manage security and threats by using Microsoft Defender XDR — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure spoof intelligence settings to block the spoofed domain — Option B is correct because spoof intelligence in Microsoft Defender for Office 365 allows you to block spoofed messages from your own domain. Option A is wrong because DKIM signing is important but does not block spoofed messages by itself. Option C is wrong because DMARC policy can help but spoof intelligence is more direct. Option D is wrong because adding domain to allowed list would actually allow spoofing.
What should I do if I get this MS-102 question wrong?
Identify which MS-102 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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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