The answer is the anti-phishing policy in Microsoft Defender for Office 365. When a malicious email from a known malicious sender domain is not blocked, the most likely cause is that the anti-phishing policy is either not applied to the affected user or contains an allowed sender or domain bypass. This policy specifically evaluates sender reputation and impersonation attempts, whereas other protections like SPF or safe attachments address different layers—SPF checks authentication, not malice, and safe attachments may miss known-bad senders if policy thresholds are misconfigured. On the SC-200 exam, this question tests your ability to prioritize policy-based controls over infrastructure checks; a common trap is jumping to SPF or DKIM first. Remember the memory tip: “Phish first, filter later”—always verify anti-phishing policies before diving into email authentication records.
SC-200 Respond to security incidents Practice Question
This SC-200 practice question tests your understanding of respond to security incidents. 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 investigating an incident where a user reported receiving a suspicious email with a malicious attachment. Microsoft Defender for Office 365 did not block it. The email originated from a known malicious sender domain. What configuration should you check 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Anti-phishing policy in Microsoft Defender for Office 365
Option C is correct. The most likely reason for the email not being blocked is that the anti-phishing policy is not properly configured or the sender is bypassed. Option A (SPF) is relevant but less likely if the domain is known malicious. Option B (safe attachments) may not catch all. Option D (user reporting) is not about blocking.
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.
✗
User-reported message settings
Why it's wrong here
This controls how users report suspicious emails, not the actual blocking.
✗
SPF record for the sender domain
Why it's wrong here
SPF is for sender authentication; the domain might be spoofing but the policy should still block based on reputation.
✗
Safe Attachments policy
Why it's wrong here
Safe Attachments scans attachments, but the email might have bypassed if policies are lax.
✓
Anti-phishing policy in Microsoft Defender for Office 365
Why this is correct
Anti-phishing policies can block emails from known malicious domains or impersonation attempts.
Clue confirmation
The clue word "first" in the question point toward this answer.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-200 question in full detail.
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 SC-200 NAT questions on configuration and troubleshooting.
Respond to security incidents — This question tests Respond to security incidents — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Anti-phishing policy in Microsoft Defender for Office 365 — Option C is correct. The most likely reason for the email not being blocked is that the anti-phishing policy is not properly configured or the sender is bypassed. Option A (SPF) is relevant but less likely if the domain is known malicious. Option B (safe attachments) may not catch all. Option D (user reporting) is not about blocking.
What should I do if I get this SC-200 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 SC-200 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "first". 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?
Static NAT maps one inside address to one outside address.
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