The correct three actions are to create a Conditional Access policy to block legacy authentication, disable SMS and voice call authentication methods, and enable passwordless authentication methods like Microsoft Authenticator or FIDO2 security keys. This combination works because blocking legacy protocols—such as POP3, IMAP, and SMTP—via Conditional Access ensures users cannot bypass modern security verification using outdated clients, while disabling SMS and voice methods eliminates weaker, phishable alternatives that could circumvent passwordless flows. On the AZ-500 exam, this scenario tests your understanding of how to enforce a secure authentication strategy by layering Conditional Access policies with authentication method controls; a common trap is assuming that blocking legacy auth alone is sufficient without also removing weaker methods like SMS. Remember the mnemonic **“Block the old, kill the SMS, go passwordless”** to recall that you must stop legacy protocols, disable SMS/voice, and enable passwordless methods in tandem.
AZ-500 Secure identity and access Practice Question
This AZ-500 practice question tests your understanding of secure identity and access. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 has a Microsoft Entra ID tenant with 10,000 users. You need to implement a secure authentication strategy that satisfies the following requirements:
- Users must not be able to bypass security verification using alternate authentication methods.
- Passwordless authentication should be used where possible.
- Legacy authentication protocols must be blocked.
Which THREE actions should you take? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a Conditional Access policy to block legacy authentication protocols.
Option A is correct because a Conditional Access policy can explicitly block legacy authentication protocols (such as POP3, IMAP, SMTP, and older Office clients) by targeting 'Exchange ActiveSync' and 'Other clients' in the client apps condition. This prevents users from bypassing modern authentication requirements and ensures that only modern authentication flows (e.g., OAuth 2.0) are allowed, which is a key requirement to block legacy protocols.
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.
✓
Create a Conditional Access policy to block legacy authentication protocols.
Read the scenario before looking for a memorised answer.
✗
Configure per-user MFA to require verification.
Why it's wrong here
Per-user MFA does not support passwordless methods and may cause issues.
✓
Enable FIDO2 security keys as an authentication method and configure passwordless sign-in.
Why this is correct
FIDO2 is a strong passwordless method.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable the 'Security defaults' feature in Microsoft Entra ID.
Why it's wrong here
Security defaults block legacy authentication only partially and may not meet all requirements.
✓
Disable SMS and voice call authentication methods in Microsoft Entra ID.
Why this is correct
This prevents users from using less secure methods.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume Security defaults is the simplest way to block legacy authentication and enforce MFA, but they overlook that Security defaults cannot be customized to selectively enable FIDO2 or disable specific methods, making it incompatible with the requirement for passwordless authentication and granular control.
Detailed technical explanation
How to think about this question
Conditional Access policies evaluate signals such as user risk, location, and client app type. When blocking legacy authentication, the policy targets 'Exchange ActiveSync clients' and 'Other clients' in the client apps condition, which covers protocols like POP3, IMAP, and SMTP that do not support modern authentication. FIDO2 security keys rely on the WebAuthn standard and are a phishing-resistant passwordless method; disabling SMS and voice calls ensures that users cannot fall back to weaker, out-of-band verification methods, thus enforcing a strict passwordless strategy.
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 AZ-500 question in full detail.
Secure identity and access — This question tests Secure identity and access — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a Conditional Access policy to block legacy authentication protocols. — Option A is correct because a Conditional Access policy can explicitly block legacy authentication protocols (such as POP3, IMAP, SMTP, and older Office clients) by targeting 'Exchange ActiveSync' and 'Other clients' in the client apps condition. This prevents users from bypassing modern authentication requirements and ensures that only modern authentication flows (e.g., OAuth 2.0) are allowed, which is a key requirement to block legacy protocols.
What should I do if I get this AZ-500 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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