What is Entra ID?
Entra ID, previously called Azure Active Directory (Azure AD), is Microsoft’s cloud-based identity and access management system. It’s like the gatekeeper of your Azure environment — deciding who can enter and what they can do once inside.
Why this matters
Every Azure service depends on identity. Virtual Machines, Storage, Databases, even Microsoft 365 apps like Teams and Outlook — all rely on Entra ID for sign-ins. If you don’t master Entra ID, you’ll struggle with RBAC, Conditional Access, or licensing questions on the exam.
Key Features
- Single Sign-On (SSO): Users log in once and access multiple apps (Azure portal, M365 apps, SaaS apps).
- Multi-Factor Authentication (MFA): Adds security by requiring extra verification (SMS, authenticator app, biometrics).
- Device Management: Can register and enforce policies on devices that access Azure resources.
- Directory Services: Acts as a central cloud directory for users, groups, and apps.
Confusion Buster 🚨
Entra ID ≠ Azure Subscription
– Entra ID = Who can sign in (identities).
– Subscription = Where billing and resources are managed.
Tip: It’s common to have one Entra ID tenant with multiple subscriptions underneath.
Simple Example
Your company has 500 employees. Instead of giving each app (Teams, Outlook, SharePoint) its own login system, Entra ID manages all accounts in one central place. When Alice signs in once, she can access both Teams and the Azure portal without re-entering her credentials.
Exam Tip
If the exam asks “Which service checks user logins in Azure?” the answer is always Entra ID. If it asks “Which service enforces policies after login?”, think RBAC or Conditional Access.
What to Expect in the Exam
- Direct questions: “What is the main identity provider for Azure?” → Entra ID.
- Scenario: “A user logs in successfully but cannot manage resources. What’s missing?” → RBAC assignment.
- Trick: Watch out for confusion between Entra roles (directory-level) and RBAC roles (resource-level).