- A
Create a Safe Links policy with a block action for URLs containing 'contos0.com'.
Why wrong: Safe Links protects against malicious URLs, not domain impersonation in email addresses.
- B
Enable mailbox intelligence in anti-phishing policies to detect unusual sender behavior.
Why wrong: Mailbox intelligence detects anomalies in user behavior, not domain impersonation.
- C
Add the spoofed domain 'contos0.com' to the Tenant Allow/Block List in the Defender for Office 365 portal.
Why wrong: This blocks only that specific domain, not future variations.
- D
Configure an anti-phishing policy to protect against impersonation of your domain, enabling the 'Protect against impersonation of domains I own' setting and adding your legitimate domain to the list of domains to protect.
This leverages Defender's impersonation protection and AI to detect similar domains automatically.
Quick Answer
The correct choice is to configure an anti-phishing policy that protects against impersonation of your domain, specifically enabling the 'Protect against impersonation of domains I own' setting and adding your legitimate domain to the list of domains to protect. This works because Microsoft Defender for Office 365 uses machine learning and domain intelligence to automatically detect and block variations of your protected domain—such as contos0.com versus contoso.com—without blocking legitimate emails from the actual domain. On the MS-102 exam, this scenario tests your understanding of anti-phishing impersonation protection for custom domain, distinguishing it from simpler block-list approaches or unrelated policies like Safe Links or mailbox intelligence. A common trap is thinking you need to manually block each spoofed variant, but the correct solution leverages Defender’s built-in impersonation intelligence to handle future variations automatically. Memory tip: think “protect the real, block the fake”—you safeguard your owned domain, and the system’s AI catches the lookalikes.
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. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 the security administrator for a multinational organization using Microsoft 365 E5. The organization has 10,000 users across three regions: North America, Europe, and Asia. You have deployed Microsoft Defender for Endpoint on all Windows devices and enabled Microsoft Defender for Office 365. Recently, a sophisticated phishing campaign targeted executives in Europe, using a custom domain that closely resembles your legitimate domain (e.g., contoso.com vs. contos0.com). The emails bypassed anti-spam and anti-phishing policies. You need to configure protection to block these impersonation attempts without affecting legitimate emails from the actual domain. You must also ensure that any similar future attempts using different variations are automatically detected. What should you do?
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
Configure an anti-phishing policy to protect against impersonation of your domain, enabling the 'Protect against impersonation of domains I own' setting and adding your legitimate domain to the list of domains to protect.
Option C is correct because adding the legitimate domain to the impersonation protection list in anti-phishing policies will protect against variations, and the policy's intelligence will detect similar domains automatically. Option A is wrong because adding the spoofed domain to the Tenant Allow/Block List would block that specific domain but not future variations. Option B is wrong because a Safe Links policy does not protect against impersonation. Option D is wrong because a mailbox intelligence policy is for user-specific phishing detection, not domain impersonation.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a Safe Links policy with a block action for URLs containing 'contos0.com'.
Why it's wrong here
Safe Links protects against malicious URLs, not domain impersonation in email addresses.
- ✗
Enable mailbox intelligence in anti-phishing policies to detect unusual sender behavior.
Why it's wrong here
Mailbox intelligence detects anomalies in user behavior, not domain impersonation.
- ✗
Add the spoofed domain 'contos0.com' to the Tenant Allow/Block List in the Defender for Office 365 portal.
Why it's wrong here
This blocks only that specific domain, not future variations.
- ✓
Configure an anti-phishing policy to protect against impersonation of your domain, enabling the 'Protect against impersonation of domains I own' setting and adding your legitimate domain to the list of domains to protect.
Why this is correct
This leverages Defender's impersonation protection and AI to detect similar domains automatically.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related MS-102 NAT questions on configuration and troubleshooting.
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Manage security and threats by using Microsoft Defender XDR — study guide chapter
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FAQ
Questions learners often ask
What does this MS-102 question test?
Manage security and threats by using Microsoft Defender XDR — This question tests Manage security and threats by using Microsoft Defender XDR — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Configure an anti-phishing policy to protect against impersonation of your domain, enabling the 'Protect against impersonation of domains I own' setting and adding your legitimate domain to the list of domains to protect. — Option C is correct because adding the legitimate domain to the impersonation protection list in anti-phishing policies will protect against variations, and the policy's intelligence will detect similar domains automatically. Option A is wrong because adding the spoofed domain to the Tenant Allow/Block List would block that specific domain but not future variations. Option B is wrong because a Safe Links policy does not protect against impersonation. Option D is wrong because a mailbox intelligence policy is for user-specific phishing detection, not domain impersonation.
What should I do if I get this MS-102 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related MS-102 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 2026
This MS-102 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the MS-102 exam.
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