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 company is adopting Microsoft Purview for data security. They need to prevent users from sharing sensitive data like credit card numbers via email. Which feature should you configure?
Audit log search
Why wrong: Audits after the fact, doesn't prevent sharing.
Data Loss Prevention (DLP) policy
Specifically blocks sharing of sensitive information.
Insider Risk Management policy
Why wrong: Focuses on user behavior, not data sharing control.
Sensitivity labels
Why wrong: Labels classify data but don't block sharing.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Data Loss Prevention (DLP) policy
Data Loss Prevention (DLP) policies in Microsoft Purview are specifically designed to detect and prevent the accidental or intentional sharing of sensitive information, such as credit card numbers, through email and other channels. By configuring a DLP policy with a rule that scans for credit card number patterns (using predefined or custom sensitive info types), the system can block, quarantine, or notify users when such data is sent via Exchange Online. This directly addresses the requirement to prevent sharing sensitive data via email.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Audit log search
Why it's wrong here
Audits after the fact, doesn't prevent sharing.
Data Loss Prevention (DLP) policy
Why this is correct
Specifically blocks sharing of sensitive information.
Related concept
Read the scenario before looking for a memorised answer.
Insider Risk Management policy
Why it's wrong here
Focuses on user behavior, not data sharing control.
Sensitivity labels
Why it's wrong here
Labels classify data but don't block sharing.
Common exam traps
The trap here is that candidates often confuse Sensitivity labels as a direct replacement for DLP, but labels are for classification and protection (e.g., encryption), not for real-time content inspection and blocking of specific data patterns like credit card numbers in email.
Detailed technical explanation
Under the hood, Microsoft Purview DLP uses sensitive information types (SITs) defined by regular expressions and keyword lists, such as the credit card number SIT (built on the Luhn check algorithm and card network prefixes). When a DLP policy is applied to Exchange Online, the transport rule agent inspects email messages at the SMTP level, evaluating both body and attachments against the SITs before the message is delivered. In a real-world scenario, a DLP policy can be configured with an action to 'Block the message' and send an 'Override with business justification' notification, allowing users to bypass the block only with a valid reason, which is audited.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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. 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.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
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..
The correct answer is: Data Loss Prevention (DLP) policy — Data Loss Prevention (DLP) policies in Microsoft Purview are specifically designed to detect and prevent the accidental or intentional sharing of sensitive information, such as credit card numbers, through email and other channels. By configuring a DLP policy with a rule that scans for credit card number patterns (using predefined or custom sensitive info types), the system can block, quarantine, or notify users when such data is sent via Exchange Online. This directly addresses the requirement to prevent sharing sensitive data via email.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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