Microsoft Security, Compliance, and Identity Fundamentals SC-900 Practice Question
Your organization uses on-premises Windows Server Active Directory and plans to adopt Microsoft 365. You must let users sign in with their existing corporate passwords, ensure no password hashes are stored in Microsoft Entra ID, and avoid deploying additional federation servers. Which hybrid identity authentication method should you choose?
Pass-through authentication
Cloud-only identities
Active Directory Federation Services (AD FS) federation
Pass-through authentication meets all the stated requirements. It installs a lightweight agent that forwards the user's password to an on-premises domain controller for real-time validation, so no password hashes are stored in the cloud and no federation servers are required.
Password hash synchronization copies a hash of each user's password to Microsoft Entra ID, which the scenario explicitly forbids.
Active Directory Federation Services (AD FS) also keeps passwords on-premises, but it requires dedicated federation and proxy servers, contradicting the goal of avoiding additional server infrastructure.
Cloud-only identities store credentials entirely in Microsoft Entra ID and do not reuse on-premises passwords, so they do not satisfy the requirement to keep the same corporate credentials.
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Why is Pass-through authentication preferred over Password hash synchronization in this scenario?
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What is the role of the lightweight agent in Pass-through authentication?
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Why is Active Directory Federation Services (AD FS) not suitable in this scenario?
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Microsoft Security, Compliance, and Identity Fundamentals SC-900
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