Quick Answer
The correct answer is the Tenant Allow/Block List because it provides immediate, tenant-wide enforcement to block a malicious URL, unlike other Defender for Office 365 features that rely on policy conditions or scanning. When your incident response team identifies a phishing campaign, this list acts as a centralized blocklist that overrides all other URL detections, ensuring the malicious link is blocked for every user in your organization without delay. On the SC-200 exam, this question tests your ability to distinguish between features that require policy configuration—like Safe Links, which blocks URLs only when a policy applies—and the Tenant Allow/Block List, which is a direct, global override. A common trap is choosing Safe Links because it also blocks URLs, but remember: Safe Links is policy-based and can take time to propagate, while the Tenant Allow/Block List is immediate and tenant-wide. Memory tip: think “Tenant Block = Instant Stop” to recall that this feature stops a URL for everyone right away, no policies needed.
This SC-200 practice question tests your understanding of respond to security incidents. 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 incident response team has identified a phishing campaign targeting your organization. The emails contain a link to a malicious site. Which Microsoft Defender for Office 365 feature should you use to block the URL across all users?
Safe Links policy
Why wrong: Safe Links can block URLs but requires policy configuration; Tenant Allow/Block List is more direct.
Anti-Phish policy
Why wrong: Anti-Phish detects impersonation, not specific URLs.
Safe Attachments policy
Why wrong: Safe Attachments focuses on email attachments, not URLs.
Tenant Allow/Block List
Tenant Allow/Block List allows immediate blocking of URLs.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Tenant Allow/Block List
Option C is correct because Tenant Allow/Block List in Defender for Office 365 allows blocking URLs at the tenant level. Option A is wrong because Safe Attachments scans attachments, not URLs. Option B is wrong because Safe Links can block URLs but is policy-based; Tenant Allow/Block List is immediate. Option D is wrong because Anti-Phish policies protect against impersonation, not specific URLs.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Safe Links policy
Why it's wrong here
Safe Links can block URLs but requires policy configuration; Tenant Allow/Block List is more direct.
Anti-Phish policy
Why it's wrong here
Anti-Phish detects impersonation, not specific URLs.
Safe Attachments policy
Why it's wrong here
Safe Attachments focuses on email attachments, not URLs.
Tenant Allow/Block List
Why this is correct
Tenant Allow/Block List allows immediate blocking of URLs.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
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
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.
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
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
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.
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FAQ
Respond to security incidents — This question tests Respond to security incidents — Static NAT maps one inside address to one outside address..
The correct answer is: Tenant Allow/Block List — Option C is correct because Tenant Allow/Block List in Defender for Office 365 allows blocking URLs at the tenant level. Option A is wrong because Safe Attachments scans attachments, not URLs. Option B is wrong because Safe Links can block URLs but is policy-based; Tenant Allow/Block List is immediate. Option D is wrong because Anti-Phish policies protect against impersonation, not specific URLs.
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.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 2026
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