SC-900 Describe the capabilities of Microsoft Entra Practice Question
A company wants to block all sign-ins using legacy authentication protocols because these protocols do not support multi-factor authentication (MFA). Which component of a Microsoft Entra ID Conditional Access policy should be configured to achieve this?
⚠ Common exam trap
Test-takers frequently confuse 'Client apps' with 'Cloud apps or actions', thinking they need to select the specific legacy app (like Exchange Online) rather than the authentication client type, which is the correct way to block the protocol itself.
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
✓
Conditions (Client apps)
To block legacy authentication protocols, you configure the 'Client apps' condition in a Conditional Access policy. This setting allows you to target specific authentication clients, such as Exchange ActiveSync, POP3, IMAP, and SMTP, which do not support MFA. By selecting 'Exchange ActiveSync clients' and 'Other clients' under the Client apps condition, you can enforce a block on all sign-ins using these legacy protocols.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Cloud apps or actions
Why it's wrong here
The "Cloud apps or actions" setting within Conditional Access policies specifies which cloud applications or user actions the policy will protect. For instance, it can target access to SharePoint Online, Exchange Online, or specific custom applications. While crucial for defining the scope of protection, this control does not dictate the *method* of authentication (e.g., legacy vs. modern) used by the client application to *reach* those cloud apps. It only determines *which* applications are in scope for the policy.
When this WOULD be correct
A question asks: 'A company wants to require MFA for all access to its financial reporting app in Microsoft Entra ID. Which component should be configured?' Here, 'Cloud apps or actions' would be correct to select the specific app.
- ✓
Conditions (Client apps)
Why this is correct
In Azure AD Conditional Access, the "Conditions" section allows administrators to define specific criteria for policy application. The "Client apps" condition specifically targets the type of client application attempting to access resources, including options to block "Other clients," which encompasses legacy authentication protocols like POP3, IMAP, SMTP, and older Office clients. By selecting this option, organizations can enforce the exclusive use of modern authentication clients, significantly enhancing security by eliminating vulnerabilities associated with less secure, basic authentication methods.
- ✗
Grant
Why it's wrong here
Grant controls specify the requirements that must be met *before* a user is granted access to a resource, such as requiring multi-factor authentication (MFA), a compliant device, or a hybrid Azure AD joined device. While these controls enhance security by enforcing additional verification steps, they operate on the *outcome* of authentication (i.e., whether access is granted) rather than blocking the *method* of authentication itself. They do not prevent a legacy client from attempting to authenticate; rather, they would deny access if the legacy client cannot satisfy the grant requirements.
When this WOULD be correct
In a scenario where the goal is to require MFA for all cloud app access, the Grant control would be configured to require MFA. For example: 'A company wants to enforce MFA for all users accessing Microsoft 365. Which component should be configured?'
- ✗
Session
Why it's wrong here
Session controls in Conditional Access are applied *after* a user has successfully authenticated and received an access token. These controls manage the user's ongoing session, dictating aspects such as sign-in frequency, persistent browser sessions, or requiring application-enforced restrictions. They are designed to manage the duration and behavior of an active session, not to block or allow the initial authentication protocol used by the client to establish that session in the first place.
When this WOULD be correct
A company wants to enforce sign-in frequency for all cloud app sessions, requiring users to re-authenticate every hour. Configuring the Session control with sign-in frequency settings would be the correct approach.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SC-900 exam frequently reuses these exact scenarios with slightly different constraints.
✓Conditions (Client apps)Correct answer▾
Why this is correct
In Azure AD Conditional Access, the "Conditions" section allows administrators to define specific criteria for policy application. The "Client apps" condition specifically targets the type of client application attempting to access resources, including options to block "Other clients," which encompasses legacy authentication protocols like POP3, IMAP, SMTP, and older Office clients. By selecting this option, organizations can enforce the exclusive use of modern authentication clients, significantly enhancing security by eliminating vulnerabilities associated with less secure, basic authentication methods.
✗Cloud apps or actionsWrong answer — click to see why▾
Why this is wrong here
The 'Cloud apps or actions' component specifies which applications or user actions the policy applies to, not the authentication protocol. Blocking legacy authentication requires configuring the 'Client apps' condition under 'Conditions'.
★ When this WOULD be the correct answer
A question asks: 'A company wants to require MFA for all access to its financial reporting app in Microsoft Entra ID. Which component should be configured?' Here, 'Cloud apps or actions' would be correct to select the specific app.
Why candidates choose this
Candidates may confuse the target of the policy (the app) with the condition that controls the authentication method, thinking that specifying the app is sufficient to block legacy protocols.
✗GrantWrong answer — click to see why▾
Why this is wrong here
The Grant control in a Conditional Access policy is used to enforce requirements like MFA or device compliance after conditions are met, not to block specific authentication protocols. Blocking legacy authentication is done by configuring the Client apps condition under Conditions.
★ When this WOULD be the correct answer
In a scenario where the goal is to require MFA for all cloud app access, the Grant control would be configured to require MFA. For example: 'A company wants to enforce MFA for all users accessing Microsoft 365. Which component should be configured?'
Why candidates choose this
Candidates may confuse the Grant control with the mechanism to block access, as it includes a 'Block access' option. However, blocking legacy authentication is a condition-based action, not a grant control.
✗SessionWrong answer — click to see why▾
Why this is wrong here
The Session control in a Conditional Access policy manages session-level behaviors like app-enforced restrictions or sign-in frequency, not the blocking of authentication protocols. Blocking legacy authentication is done by configuring the Client apps condition under Conditions.
★ When this WOULD be the correct answer
A company wants to enforce sign-in frequency for all cloud app sessions, requiring users to re-authenticate every hour. Configuring the Session control with sign-in frequency settings would be the correct approach.
Why candidates choose this
Candidates may confuse Session controls with authentication protocol controls, thinking that session settings can block legacy protocols, or they may not clearly distinguish between Conditions and Session in Conditional Access policies.
Analysis generated from the official SC-900blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Go deeper
Related to this question
Learn chapter
Microsoft Entra ID
Key term
Authentication
Authentication is the process of verifying that someone or something is who or what it claims to be before granting access to a system or resource.
Key term
MFA
Multi-Factor Authentication (MFA) is a security method that requires a user to verify their identity using two or more different types of evidence, such as a password plus a code from a phone, before they can access an account or system.
About these practice questions
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SC-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SC-900 exam.