MS-900 Practice Question: Describe security, compliance, privacy, and trust in Microsoft 365
This MS-900 practice question tests your understanding of describe security, compliance, privacy, and trust in microsoft 365. 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.
Exhibit
Refer to the exhibit.
```json
{
"displayName": "External Sharing Policy",
"sharingAllowedDomainList": ["fabrikam.com"],
"sharingBlockedDomainList": [],
"sharingCapability": "ExternalUserAndGuestSharing",
"requireExternalUserAcceptance": true
}
```
An administrator configures the SharePoint Online sharing policy as shown in the exhibit. What is the result of this configuration?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
External users and guests from fabrikam.com can access content after accepting an invitation.
Option D is correct. The policy allows sharing with external users and guests, but only from fabrikam.com, and requires them to accept the sharing invitation. Option A is wrong because the capability is ExternalUserAndGuestSharing, not just guest sharing. Option B is wrong because the allowed domain list permits fabrikam.com. Option C is wrong because the blocked domain list is empty.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
External users from any domain can access content without accepting an invitation.
Why it's wrong here
The requireExternalUserAcceptance is true, so acceptance is required.
✗
Only guests from any domain can access, but external users must be added manually.
Why it's wrong here
The policy allows both external users and guests, and the allowed domain list restricts to fabrikam.com.
✓
External users and guests from fabrikam.com can access content after accepting an invitation.
Why this is correct
The policy allows external user and guest sharing, restricts to fabrikam.com, and requires acceptance.
Related concept
Standard ACLs match source addresses.
✗
External sharing is blocked for all domains except fabrikam.com.
Why it's wrong here
The policy allows sharing with fabrikam.com, not blocks others.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-900 question in full detail.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related MS-900 ACL questions on filtering logic and placement.
Describe security, compliance, privacy, and trust in Microsoft 365 — This question tests Describe security, compliance, privacy, and trust in Microsoft 365 — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: External users and guests from fabrikam.com can access content after accepting an invitation. — Option D is correct. The policy allows sharing with external users and guests, but only from fabrikam.com, and requires them to accept the sharing invitation. Option A is wrong because the capability is ExternalUserAndGuestSharing, not just guest sharing. Option B is wrong because the allowed domain list permits fabrikam.com. Option C is wrong because the blocked domain list is empty.
What should I do if I get this MS-900 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related MS-900 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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