The Microsoft Authenticator app with passwordless sign-in is the correct primary method for implementing passwordless authentication on smartphones in a Microsoft Entra ID environment. This recommendation is rooted in the technical concept of FIDO2/WebAuthn public/private key cryptography, which creates a phishing-resistant credential stored securely on the device, requiring only a biometric or PIN verification to authenticate—eliminating passwords entirely while leveraging the smartphone’s existing hardware. On the Microsoft Cybersecurity Architect exam, this scenario tests your understanding of Microsoft’s passwordless deployment hierarchy, where Microsoft Authenticator is the recommended primary method for users with smartphones, often appearing as a distractor against options like Windows Hello or FIDO2 security keys. A common trap is choosing a hardware security key because it is also phishing-resistant, but the question specifies smartphones, making the app the most seamless and cost-effective choice. Memory tip: Think “phone-first, key-second”—if users have smartphones, Microsoft Authenticator is the primary passwordless method.
SC-100 Practice Question: Design security operations, identity, and compliance capabilities
This SC-100 practice question tests your understanding of design security operations, identity, and compliance capabilities. 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 organization uses Microsoft Entra ID and wants to implement a passwordless authentication strategy. Users have smartphones. Which method should you recommend as the primary authentication method?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Microsoft Authenticator app with passwordless sign-in
The Microsoft Authenticator app with passwordless sign-in is the correct primary method because it leverages the user's smartphone to provide a seamless, phishing-resistant authentication experience using public/private key cryptography (FIDO2/WebAuthn). This method aligns with the organization's goal of eliminating passwords while utilizing existing smartphone hardware, and it supports a simple user experience by requiring only a biometric or PIN verification on the phone.
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.
✗
FIDO2 security keys
Why it's wrong here
FIDO2 keys require physical hardware tokens, which may not be available to all users.
✓
Microsoft Authenticator app with passwordless sign-in
Why this is correct
Microsoft Authenticator supports passwordless sign-in using phone, making it suitable for users with smartphones.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
SMS-based authentication
Why it's wrong here
SMS is not passwordless and is considered less secure due to SIM swapping risks.
✗
Windows Hello for Business
Why it's wrong here
Windows Hello for Business requires Windows 10/11 devices, not just smartphones.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'passwordless' with 'MFA' and select SMS-based authentication, not realizing that SMS still relies on a shared secret (the code) and is not truly passwordless or phishing-resistant.
Detailed technical explanation
How to think about this question
Microsoft Authenticator's passwordless sign-in uses the FIDO2/WebAuthn standard, where the private key is stored in the device's TPM or secure enclave and never leaves the phone. The authentication flow involves the user entering their username, receiving a push notification, and then approving the sign-in with a biometric or PIN, which triggers an asymmetric key exchange with Entra ID. In a real-world scenario, this method also supports conditional access policies, such as requiring a specific location or device compliance, without exposing any password or shared secret.
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-100 question in full detail.
Design security operations, identity, and compliance capabilities — This question tests Design security operations, identity, and compliance capabilities — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Microsoft Authenticator app with passwordless sign-in — The Microsoft Authenticator app with passwordless sign-in is the correct primary method because it leverages the user's smartphone to provide a seamless, phishing-resistant authentication experience using public/private key cryptography (FIDO2/WebAuthn). This method aligns with the organization's goal of eliminating passwords while utilizing existing smartphone hardware, and it supports a simple user experience by requiring only a biometric or PIN verification on the phone.
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.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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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