- A
Configure a conditional access policy to block access from untrusted networks when credit card numbers are detected
Why wrong: Conditional access controls access, not sharing.
- B
Create a Microsoft Purview sensitivity label that automatically applies encryption and blocks external sharing when credit card numbers are detected
Sensitivity labels can automatically classify and protect data, and enforce restrictions like blocking external sharing.
- C
Create a Microsoft Purview Data Loss Prevention (DLP) policy that blocks external sharing when credit card numbers are detected
Why wrong: DLP policies block sharing based on content, but the question asks about protecting data with sensitivity labels.
- D
Use Azure Information Protection to label and protect files with credit card numbers
Why wrong: Azure Information Protection is the predecessor; current product is Microsoft Purview Information Protection.
Quick Answer
The answer is to create a Microsoft Purview sensitivity label that automatically applies encryption and blocks external sharing when credit card numbers are detected. This is correct because Purview sensitivity labels can be configured with automatic classification using sensitive information types, such as the built-in credit card number data type, and then enforce protection actions like encryption and blocking external sharing directly on files in SharePoint Online. On the Microsoft Cybersecurity Architect exam, this scenario tests your understanding of how to integrate data classification with conditional access and protection policies, often appearing as a distractor against using Data Loss Prevention (DLP) policies alone—DLP can detect and block sharing, but only sensitivity labels can automatically encrypt the file as a prerequisite to blocking external access. A key memory tip is to remember that labels handle the “what happens to the file” (encryption + sharing block), while DLP handles the “what happens to the sharing action” (block or warn). Think: “Label locks the file, DLP locks the door.”
SC-100 Practice Question: Design solutions that align with security best practices and priorities
This SC-100 practice question tests your understanding of design solutions that align with security best practices and priorities. 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.
A security architect is designing a solution to protect sensitive data stored in SharePoint Online from being shared with unauthorized users. The solution must block sharing of files containing credit card numbers when shared externally. What should they use?
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
Create a Microsoft Purview sensitivity label that automatically applies encryption and blocks external sharing when credit card numbers are detected
Option B is correct because Microsoft Purview sensitivity labels can be configured with automatic classification for sensitive data types (e.g., credit card numbers) and enforce encryption while blocking external sharing. This directly meets the requirement to prevent unauthorized external sharing of files containing credit card numbers in SharePoint Online.
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.
- ✗
Configure a conditional access policy to block access from untrusted networks when credit card numbers are detected
Why it's wrong here
Conditional access controls access, not sharing.
- ✓
Create a Microsoft Purview sensitivity label that automatically applies encryption and blocks external sharing when credit card numbers are detected
Why this is correct
Sensitivity labels can automatically classify and protect data, and enforce restrictions like blocking external sharing.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a Microsoft Purview Data Loss Prevention (DLP) policy that blocks external sharing when credit card numbers are detected
Why it's wrong here
DLP policies block sharing based on content, but the question asks about protecting data with sensitivity labels.
- ✗
Use Azure Information Protection to label and protect files with credit card numbers
Why it's wrong here
Azure Information Protection is the predecessor; current product is Microsoft Purview Information Protection.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse DLP policies (which block sharing based on content) with sensitivity labels (which can both block sharing and apply encryption), leading them to select Option C without considering the need for encryption.
Detailed technical explanation
How to think about this question
Microsoft Purview sensitivity labels use exact data match (EDM) or built-in sensitive information types (e.g., Credit Card Number) to automatically classify content. When applied, the label can enforce encryption via Azure Rights Management (RMS) and set sharing permissions, including blocking external sharing at the SharePoint item level. This works by the label applying a protection template that restricts access to only authorized internal users, overriding any broader sharing settings.
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.
TExam Day Tips
- 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.
What to study next
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Design solutions that align with security best practices and priorities — study guide chapter
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FAQ
Questions learners often ask
What does this SC-100 question test?
Design solutions that align with security best practices and priorities — This question tests Design solutions that align with security best practices and priorities — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a Microsoft Purview sensitivity label that automatically applies encryption and blocks external sharing when credit card numbers are detected — Option B is correct because Microsoft Purview sensitivity labels can be configured with automatic classification for sensitive data types (e.g., credit card numbers) and enforce encryption while blocking external sharing. This directly meets the requirement to prevent unauthorized external sharing of files containing credit card numbers in SharePoint Online.
What should I do if I get this SC-100 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 24, 2026
This SC-100 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 SC-100 exam.
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