Microsoft Purview Information Barriers: Block Communication Between Groups
A financial company needs to prevent any communication between their mergers and acquisitions (M&A) team and the trading desk across all Microsoft 365 channels, including email, Microsoft Teams, and SharePoint. They must ensure that no user in one group can send emails to or chat with users in the other group. Which Microsoft Purview solution should they implement?
Quick Answer
The answer is Microsoft Purview Information Barriers. This solution is correct because it enforces communication restrictions between defined user segments—like the M&A team and trading desk—across all Microsoft 365 channels, including email, Microsoft Teams, and SharePoint, by blocking transport, chat, and document-level interactions at the policy level. On the SC-900 exam, this question tests your understanding of how Information Barriers differ from other compliance solutions, such as Communication Compliance (which monitors, not blocks) or Data Loss Prevention (which controls data sharing, not communication). A common trap is confusing Information Barriers with retention policies or sensitivity labels, but remember that IB is the only tool designed to prevent communication between groups. For a quick memory tip, think “IB = Isolation Barriers” to recall that its sole purpose is to block collaboration between specific teams.
⚠ Common exam trap
Candidates often confuse Information Barriers with Communication Compliance, mistakenly thinking that monitoring and blocking are the same, but Communication Compliance only detects and reports violations after the fact, whereas Information Barriers proactively prevents communication from occurring.
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
✓
Information Barriers
Information Barriers (IB) is the correct solution because it is specifically designed to prevent communication and collaboration between two user groups across Microsoft 365 services, including email, Teams, and SharePoint. By defining policies that block segments (e.g., M&A team and trading desk), IB enforces restrictions at the transport, chat, and document level, ensuring no email, chat, or file sharing occurs between the groups. This directly addresses the requirement to isolate the M&A team from the trading desk across all channels.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Information Barriers
Why this is correct
Correct. Information Barriers enforce restrictions between user segments to prevent unwanted communication and collaboration.
- ✗
Communication Compliance
Why it's wrong here
Incorrect. Communication Compliance monitors and alerts on policy violations but does not block communications; it is for detection, not prevention.
- ✗
Data Lifecycle Management
Why it's wrong here
Incorrect. Data Lifecycle Management governs retention and deletion of data, not who can communicate.
- ✗
Data Loss Prevention (DLP)
Why it's wrong here
Incorrect. DLP policies prevent sensitive information from being shared, but do not restrict communication between specific groups based on organizational boundaries.
Go deeper
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Microsoft Entra ID
Key term
Microsoft 365
Microsoft 365 is a subscription-based cloud service from Microsoft that combines productivity tools like Office apps with security, device management, and online storage.
Key term
User
A user is any person, system, or device that interacts with an IT service, resource, or identity system, typically authenticated through credentials and authorized to perform specific actions.
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Same concept, more angles
3 more ways this is tested on SC-900
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A financial services firm uses Microsoft Purview Information Barriers to prevent traders from communicating with investment bankers. A new employee in the trading department cannot access a SharePoint site used for compliance training. What should the administrator do?
hard- A.Add the employee to the 'Traders' Microsoft 365 group.
- ✓ B.Add the employee to the 'Traders' segment in Microsoft Purview Information Barriers.
- C.Use the 'Override' option in the Information Barrier policy.
- D.Disable the Information Barrier policy for the trading department.
Why B: Microsoft Purview Information Barriers use segments to group users based on their organizational roles. Adding the new employee to the 'Traders' segment ensures that the Information Barrier policy applies to them correctly, allowing them to access the compliance training SharePoint site while still being blocked from communicating with investment bankers.
Variation 2. Your organization uses Microsoft Purview Information Barriers to prevent certain user groups from communicating with each other. You need to test the configuration before fully enforcing it. What should you do?
medium- ✓ A.Run the Information Barriers policy in test mode
- B.Define user segments in the Microsoft Purview compliance portal
- C.Enable audit logging and then run the policy application
- D.Use the Compliance Manager assessment for Information Barriers
Why A: Microsoft Purview Information Barriers include a dedicated test mode that allows administrators to validate policy behavior against user segments before enforcement. Running the policy in test mode evaluates whether communications between specified segments are correctly blocked or allowed, without actually preventing messages, enabling safe validation of the configuration.
Variation 3. A financial services organization needs to prevent communication between its research analysts and investment bankers to comply with regulatory requirements. Which Microsoft Purview solution should the compliance team implement?
medium- A.Data Loss Prevention (DLP)
- ✓ B.Information Barriers
- C.Data Lifecycle Management
- D.Microsoft Purview eDiscovery
Why B: Information Barriers (IB) in Microsoft Purview is specifically designed to prevent communication and collaboration between certain user groups to comply with regulatory requirements, such as those in financial services that require separation between research analysts and investment bankers. IB policies enforce restrictions on Microsoft Teams, SharePoint, and OneDrive to block unauthorized communication and file sharing, directly addressing the need to avoid conflicts of interest.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SC-900 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-900 exam.