Question 350 of 975

Implement and manage identity and access in Microsoft Entra ID →mediumMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is to configure the Conditional Access policy under 'Conditions' > 'Client apps' to block 'Exchange ActiveSync clients and other clients'. This setting is specifically designed to block legacy authentication protocols like POP3 and SMTP, which do not support modern authentication methods such as OAuth 2.0. Since the internal application cannot be updated, targeting this client apps condition effectively stops all authentication attempts from non-modern clients while preserving modern authentication flows for other applications. On the MS-102 exam, this scenario tests your understanding of how Conditional Access distinguishes between modern and legacy authentication; a common trap is confusing this with blocking browser-based sessions or specific device platforms. Remember that any protocol using basic authentication—POP3, SMTP, IMAP, or older Exchange ActiveSync—falls under the "other clients" umbrella. A useful memory tip: "If it can’t do modern auth, block it with 'other clients'."

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 and wants to block all authentication attempts from an internal legacy application that uses POP3 and SMTP protocols. The application cannot be updated and must be blocked from accessing Exchange Online. Which Conditional Access policy setting should the administrator configure?

Question 1mediummultiple choice

Full question →

A
Under 'Grant', select 'Block access'
Why wrong: Grant controls are applied after authentication. Block access is a valid grant but does not specifically target only legacy protocols; it would block all access. More precise to use client apps condition.
B
Under 'Conditions' > 'Client apps', configure to block 'Exchange ActiveSync clients and other clients'
This setting explicitly targets legacy authentication clients (including POP3/SMTP). By setting the action to block, all attempts from those clients are denied.
C
Under 'Conditions' > 'Device platforms', select 'Android' and 'iOS' and block them
Why wrong: Device platform condition does not address the protocol used. Legacy auth can occur from any platform; this would not block POP3/SMTP from Windows.
D
Under 'Conditions' > 'Locations', select 'All trusted locations' and block
Why wrong: Locations condition is about network locations, not authentication protocols. It would not block legacy auth from inside the network.

Full breakdown with real-world context →

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

✓

Under 'Conditions' > 'Client apps', configure to block 'Exchange ActiveSync clients and other clients'

Option B is correct because the legacy application uses POP3 and SMTP, which are non-modern authentication protocols. In Conditional Access, the 'Client apps' condition includes a setting to block 'Exchange ActiveSync clients and other clients', which specifically targets legacy authentication protocols like POP3, SMTP, and IMAP. This allows the administrator to block all authentication attempts from such clients without affecting modern authentication flows.

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.

✗
Under 'Grant', select 'Block access'
Why it's wrong here
Grant controls are applied after authentication. Block access is a valid grant but does not specifically target only legacy protocols; it would block all access. More precise to use client apps condition.
✓
Under 'Conditions' > 'Client apps', configure to block 'Exchange ActiveSync clients and other clients'
Why this is correct
This setting explicitly targets legacy authentication clients (including POP3/SMTP). By setting the action to block, all attempts from those clients are denied.
Related concept
Read the scenario before looking for a memorised answer.
✗
Under 'Conditions' > 'Device platforms', select 'Android' and 'iOS' and block them
Why it's wrong here
Device platform condition does not address the protocol used. Legacy auth can occur from any platform; this would not block POP3/SMTP from Windows.
✗
Under 'Conditions' > 'Locations', select 'All trusted locations' and block
Why it's wrong here
Locations condition is about network locations, not authentication protocols. It would not block legacy auth from inside the network.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse 'Client apps' with device or location conditions, mistakenly thinking that blocking a device platform or location will stop legacy protocol traffic, when in fact legacy authentication bypasses those controls entirely because it does not use modern token-based authentication.

Detailed technical explanation

How to think about this question

Under the hood, Conditional Access policies evaluate authentication requests at the token issuance layer. Legacy protocols like POP3 and SMTP do not support modern authentication (OAuth 2.0), so they cannot be controlled by policies that require modern authentication flows. The 'Client apps' condition with 'Exchange ActiveSync clients and other clients' effectively blocks Basic Authentication for these protocols, which is the only way to enforce a block on non-upgradable legacy apps. In real-world scenarios, this is often used alongside authentication strength policies to gradually phase out legacy protocols.

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: Under 'Conditions' > 'Client apps', configure to block 'Exchange ActiveSync clients and other clients' — Option B is correct because the legacy application uses POP3 and SMTP, which are non-modern authentication protocols. In Conditional Access, the 'Client apps' condition includes a setting to block 'Exchange ActiveSync clients and other clients', which specifically targets legacy authentication protocols like POP3, SMTP, and IMAP. This allows the administrator to block all authentication attempts from such clients without affecting modern authentication flows.

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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