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Deploy and manage a Microsoft 365 tenant →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is that the conditional access policy does not include the 'All' client apps condition, only specific client app types. This is the most likely reason legacy authentication is still working because Exchange ActiveSync (EAS) is treated as a separate client app type in Microsoft Entra ID; a policy targeting only "Browser" or "Mobile apps and desktop clients" will not apply to EAS traffic, allowing it to bypass the block. On the MS-102 exam, this tests your understanding that blocking legacy authentication requires the 'All' client apps condition to cover every protocol, including EAS, POP, and IMAP—a common trap where candidates assume selecting individual app types is sufficient. The key insight is that "All" is not just a catch-all but a necessary toggle to enforce the policy across every legacy endpoint. Memory tip: think "All or nothing"—if you don't select 'All' client apps, legacy authentication will still get through.

MS-102 Deploy and manage a Microsoft 365 tenant Practice Question

This MS-102 practice question tests your understanding of deploy and manage a microsoft 365 tenant. 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.

Exhibit

Refer to the exhibit.

```json
{
  "displayName": "Block Legacy Auth",
  "state": "enabled",
  "conditions": {
    "applications": {
      "includeApplications": ["All"]
    },
    "users": {
      "includeUsers": ["All"]
    },
    "clientAppTypes": [
      "exchangeActiveSync",
      "otherClients"
    ]
  },
  "grantControls": {
    "builtInControls": ["block"],
    "operator": "OR"
  }
}
```

You are reviewing a conditional access policy in Microsoft Entra ID. The policy is intended to block legacy authentication. However, users are still able to connect using Exchange ActiveSync without modern authentication. What is the most likely reason?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

  • Clue: "most likely"

    Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Question 1hardmultiple choice
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Exhibit

Refer to the exhibit.

```json
{
  "displayName": "Block Legacy Auth",
  "state": "enabled",
  "conditions": {
    "applications": {
      "includeApplications": ["All"]
    },
    "users": {
      "includeUsers": ["All"]
    },
    "clientAppTypes": [
      "exchangeActiveSync",
      "otherClients"
    ]
  },
  "grantControls": {
    "builtInControls": ["block"],
    "operator": "OR"
  }
}
```

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

✓

The policy does not include the 'All' client apps condition; it only includes specific client app types.

Option A is correct because Conditional Access policies that block legacy authentication must include the 'All' client apps condition to cover Exchange ActiveSync (EAS). If the policy only targets specific client app types (e.g., browser or mobile apps and desktop clients) but omits 'All', EAS traffic using legacy authentication bypasses the policy. EAS is a separate client app type that requires explicit inclusion via the 'All' option to enforce blocking.

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.

  • ✓

    The policy does not include the 'All' client apps condition; it only includes specific client app types.

    Why this is correct

    The policy only blocks 'exchangeActiveSync' and 'otherClients', but some legacy clients (like Outlook for iOS using basic auth) fall under 'mobile apps and desktop clients', which are not blocked.

    Clue confirmation

    The clue word "most likely" in the question point toward this answer.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    The policy is not assigned to the affected users.

    Why it's wrong here

    The policy targets 'All' users.

  • ✗

    The grant control 'Block' is not supported for legacy authentication.

    Why it's wrong here

    Block is supported for legacy authentication.

  • ✗

    The policy is in report-only mode.

    Why it's wrong here

    The exhibit shows state is 'enabled', not 'report-only'.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates assume selecting 'Mobile apps and desktop clients' covers all non-browser clients, but Exchange ActiveSync is a distinct legacy protocol that requires the 'All' client apps condition to be blocked.

Trap categories for this question

  • Command / output trap

    The exhibit shows state is 'enabled', not 'report-only'.

Detailed technical explanation

How to think about this question

Exchange ActiveSync uses the 'Exchange ActiveSync' client app type in Conditional Access, which is only covered when the policy includes 'All' client apps or explicitly selects 'Exchange ActiveSync' under 'Modern authentication clients'. Legacy authentication protocols like EAS do not support claims-based authentication, so the policy must be applied at the protocol level via the 'All' client apps condition. In real-world scenarios, administrators often forget that EAS is a separate client app type and assume 'Mobile apps and desktop clients' covers it, leading to this bypass.

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?

Deploy and manage a Microsoft 365 tenant — This question tests Deploy and manage a Microsoft 365 tenant — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The policy does not include the 'All' client apps condition; it only includes specific client app types. — Option A is correct because Conditional Access policies that block legacy authentication must include the 'All' client apps condition to cover Exchange ActiveSync (EAS). If the policy only targets specific client app types (e.g., browser or mobile apps and desktop clients) but omits 'All', EAS traffic using legacy authentication bypasses the policy. EAS is a separate client app type that requires explicit inclusion via the 'All' option to enforce blocking.

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.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 24, 2026

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