Free sections from Ultra Transcenders AB-900: Microsoft 365 Copilot and Agent Administration Fundamentals, on the comparisons and decisions the exam keeps asking about.
Verify explicitly, use least privilege access and assume breach, and the pillars they apply to.
How Conditional Access turns sign-in signals into block or grant decisions, and what licence it needs.
What the score measures, how often it is recalculated and which recommendations raise it.
What each Exchange Online mailbox permission allows and which recipients and groups can hold it.
Sharing-link, permission and Everyone except external users reports for finding oversharing.
How restricted site access limits a site to members of chosen groups, even for users with permission.
What the two built-in reasoning agents are for, how they are deployed and when a custom agent fits.
How billing policies connect metered Copilot Chat and SharePoint agent use to an Azure subscription, and what budgets do.