The answer is to create a Conditional Access policy that blocks legacy authentication. This is correct because Microsoft Entra ID’s Conditional Access allows you to target the ‘Client apps’ condition, specifically selecting ‘Exchange ActiveSync clients’ and ‘Other clients’, which effectively blocks outdated protocols like POP3, IMAP, and basic auth while permitting modern protocols such as OAuth 2.0 and OpenID Connect. On the AZ-500 exam, this scenario tests your ability to apply granular access controls within a hybrid identity model, often appearing as a scenario where you must distinguish between blocking legacy auth and disabling authentication methods entirely. A common trap is confusing this with disabling legacy protocols at the tenant level via authentication methods policies, which is less precise. Remember the mnemonic “LAMP” for Legacy Auth Must be Policy-blocked—Conditional Access is the scalpel, not the sledgehammer.
AZ-500 Secure identity and access Practice Question
This AZ-500 practice question tests your understanding of secure identity and access. 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 with a hybrid identity model. You need to implement a solution that allows you to block legacy authentication attempts while still allowing modern authentication protocols. What should you use?
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
Conditional Access policies in Microsoft Entra ID allow you to explicitly block legacy authentication protocols (such as POP3, IMAP, SMTP, and basic auth) while permitting modern authentication (OAuth 2.0, OpenID Connect). By targeting the 'Client apps' condition and selecting 'Exchange ActiveSync clients' and 'Other clients', you can block all legacy auth attempts without affecting modern protocol traffic. This is the precise, granular control required for a hybrid identity model.
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
Why this is correct
Conditional Access can block legacy authentication while allowing modern authentication protocols.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable Security defaults
Why it's wrong here
Security defaults block all legacy authentication but do not allow selective enablement of modern protocols.
✗
Use Identity Protection to detect legacy authentication
Why it's wrong here
Identity Protection detects risky sign-ins but does not block legacy authentication.
✗
Configure MFA for all users
Why it's wrong here
MFA does not block legacy authentication; it only adds a second factor.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Identity Protection's risk-based detection with the ability to block legacy authentication, or assume that enabling MFA alone will prevent legacy auth, when in fact legacy clients can still authenticate with just a password if the protocol is not explicitly blocked.
Detailed technical explanation
How to think about this question
Legacy authentication protocols (POP3, IMAP4, SMTP AUTH, and Exchange ActiveSync with basic auth) do not support modern authentication flows like OAuth 2.0 or device-based conditional access. When a Conditional Access policy blocks 'Other clients', it targets any client that does not use modern authentication, effectively denying all legacy auth attempts at the Entra ID authentication layer. In a hybrid identity model, this policy can be scoped to specific users, groups, or locations, ensuring that service accounts or break-glass accounts using legacy protocols are not inadvertently locked out.
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 — Conditional Access policies in Microsoft Entra ID allow you to explicitly block legacy authentication protocols (such as POP3, IMAP, SMTP, and basic auth) while permitting modern authentication (OAuth 2.0, OpenID Connect). By targeting the 'Client apps' condition and selecting 'Exchange ActiveSync clients' and 'Other clients', you can block all legacy auth attempts without affecting modern protocol traffic. This is the precise, granular control required for a hybrid identity model.
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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