- A
Grant access requiring multi-factor authentication
Why wrong: Legacy authentication clients cannot perform MFA, so this condition would block them, but it's better to explicitly block them via the client apps condition.
- B
Block access for apps using legacy authentication
Under 'Client apps', you can select 'Exchange ActiveSync clients' and 'Other clients' to block legacy authentication protocols.
- C
Require compliant device
Why wrong: This requires the device to be managed and compliant, but legacy auth clients may not be able to report compliance, and this does not specifically target legacy auth.
- D
Require approved client app
Why wrong: This restricts access to approved apps (e.g., Outlook mobile), but legacy auth protocols are not considered approved apps.
Quick Answer
The correct answer is to configure a Conditional Access policy to block access for apps using legacy authentication. This setting is specifically designed to target authentication attempts from protocols like POP3, IMAP, and SMTP, which lack support for modern security controls such as multi-factor authentication. By selecting this option, the policy directly intercepts and denies any legacy authentication request, regardless of user or device compliance, making it the precise tool for the scenario described. On the MS-102 exam, this question tests your ability to map a security requirement—blocking protocols that cannot enforce MFA—to the correct Conditional Access grant control, often appearing as a distractor alongside options like “require MFA” or “block access by location.” A common trap is choosing a policy that requires MFA, but since legacy protocols cannot process MFA challenges, the only effective action is to block them outright. Remember the mnemonic “LAMP” for Legacy Authentication Must be Prevented—if the protocol can’t do MFA, block it, don’t require it.
MS-102 Practice Question: Implement and manage identity and access in Microsoft Entra ID
This MS-102 practice question tests your understanding of implement and manage identity and access in microsoft entra id. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A company uses Microsoft Entra ID P2 licenses. They want to block all authentication attempts from an internal app that uses legacy authentication protocols (POP3, IMAP, SMTP) because these protocols cannot enforce multi-factor authentication. Which Conditional Access policy setting should be used?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Block access for apps using legacy authentication
Option B is correct because the scenario explicitly requires blocking authentication attempts from an internal app using legacy protocols (POP3, IMAP, SMTP) that cannot enforce multi-factor authentication. The 'Block access for apps using legacy authentication' Conditional Access setting targets client apps that use legacy authentication protocols, effectively preventing any authentication from those apps regardless of user or device compliance.
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.
- ✗
Grant access requiring multi-factor authentication
Why it's wrong here
Legacy authentication clients cannot perform MFA, so this condition would block them, but it's better to explicitly block them via the client apps condition.
- ✓
Block access for apps using legacy authentication
Why this is correct
Under 'Client apps', you can select 'Exchange ActiveSync clients' and 'Other clients' to block legacy authentication protocols.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Require compliant device
Why it's wrong here
This requires the device to be managed and compliant, but legacy auth clients may not be able to report compliance, and this does not specifically target legacy auth.
- ✗
Require approved client app
Why it's wrong here
This restricts access to approved apps (e.g., Outlook mobile), but legacy auth protocols are not considered approved apps.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'Require MFA' (which still allows legacy apps to attempt authentication and fail silently) with 'Block legacy authentication' (which explicitly prevents the authentication attempt at the protocol level), leading them to choose Option A instead of B.
Detailed technical explanation
How to think about this question
Legacy authentication protocols like POP3, IMAP, and SMTP do not support modern authentication flows such as OAuth 2.0 or SAML, meaning they cannot enforce Conditional Access policies like MFA or device compliance. The 'Block access for apps using legacy authentication' setting in Conditional Access works by inspecting the 'Client App' condition and blocking any request that uses basic authentication, which is identified via the 'X-MS-Forwarded-Client-IP' header or the 'apptype' claim in the token. In real-world scenarios, organizations often combine this with a 'Grant' control to require MFA for all other apps, ensuring legacy protocols are blocked while modern apps remain secured.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this MS-102 question test?
Implement and manage identity and access in Microsoft Entra ID — This question tests Implement and manage identity and access in Microsoft Entra ID — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Block access for apps using legacy authentication — Option B is correct because the scenario explicitly requires blocking authentication attempts from an internal app using legacy protocols (POP3, IMAP, SMTP) that cannot enforce multi-factor authentication. The 'Block access for apps using legacy authentication' Conditional Access setting targets client apps that use legacy authentication protocols, effectively preventing any authentication from those apps regardless of user or device compliance.
What should I do if I get this MS-102 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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Last reviewed: Jun 11, 2026
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