SC-900 Describe the capabilities of Microsoft Entra Practice Question
This SC-900 practice question tests your understanding of describe the capabilities of microsoft entra. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 company uses Microsoft Entra ID and wants to implement a passwordless authentication strategy for all users. You have a mix of Windows 10 devices, iOS devices, and Android devices. You need a solution that works across all platforms and does not require users to remember passwords. What should you implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy Microsoft Authenticator with phone sign-in enabled for all users.
Microsoft Authenticator with phone sign-in enabled provides a cross-platform passwordless authentication solution that works on Windows 10, iOS, and Android devices. It uses a key-based authentication model where the user's phone generates a cryptographic key pair, eliminating the need for passwords while supporting all required device types.
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.
✗
Deploy FIDO2 security keys to all users and register them in Microsoft Entra ID.
Why it's wrong here
Incorrect: FIDO2 keys require hardware that may not be available to all users and are less mobile.
✓
Deploy Microsoft Authenticator with phone sign-in enabled for all users.
Why this is correct
Correct: Works across Windows, iOS, and Android without passwords.
Related concept
Read the scenario before looking for a memorised answer.
✗
Implement certificate-based authentication using smart cards.
Why it's wrong here
Incorrect: Requires PKI and smart card readers, not viable for all devices.
✗
Enable Windows Hello for Business on all Windows devices.
Why it's wrong here
Incorrect: Does not work on iOS or Android.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume FIDO2 security keys (Option A) are the only true passwordless solution, but they overlook the cross-platform limitation and the fact that Microsoft Authenticator also implements FIDO2/WebAuthn, making it the more practical choice for heterogeneous device environments.
Detailed technical explanation
How to think about this question
Microsoft Authenticator uses the FIDO2/WebAuthn standard under the hood, where the phone acts as a roaming authenticator. The phone sign-in feature creates a device-bound key pair stored in the phone's TPM or secure enclave, and during authentication, the user verifies via biometric or PIN, which then signs a challenge from Microsoft Entra ID. This approach ensures that even if the phone is lost, the key cannot be extracted without the user's biometric or PIN, providing strong phishing resistance.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-900 question in full detail.
Describe the capabilities of Microsoft Entra — This question tests Describe the capabilities of Microsoft Entra — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy Microsoft Authenticator with phone sign-in enabled for all users. — Microsoft Authenticator with phone sign-in enabled provides a cross-platform passwordless authentication solution that works on Windows 10, iOS, and Android devices. It uses a key-based authentication model where the user's phone generates a cryptographic key pair, eliminating the need for passwords while supporting all required device types.
What should I do if I get this SC-900 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.
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Question Discussion
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