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Microsoft Entra ID vs Active Directory

Understanding the Differences and Making the Right Choice

In the world of IT management, particularly in identity and access management, Microsoft’s Active Directory (AD) and Azure Active Directory (now known as Microsoft Entra ID) stand out as two pivotal technologies. Though they share a common lineage and a similar name, their functionalities and use cases diverge significantly, tailored to distinct environments and needs. This detailed guide explores the core differences between Active Directory and Microsoft Entra ID, and provides insights on how to choose the most suitable option for your business.

What is Active Directory?

Active Directory is a directory service developed by Microsoft for Windows domain networks. It is included in most Windows Server operating systems as a set of processes and services. Initially released with Windows 2000 Server edition, it became an essential tool for managing network resources.

AD allows network administrators to create and manage domains, users, and objects within a network. For example, an administrator can set up user accounts and manage their permissions, ensuring they have access to the right resources, like file shares, printers, and Outlook mailboxes.

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Core Features of Active Directory:

  • Domain Services: Manage users, computers, and other devices within the network domain, and enforce security policies.
  • Lightweight Directory Services: Support for directory-enabled applications without requiring modifications to existing AD deployments.
  • Certificate Services: Issue and manage digital certificates to support secure communications and transactions.
  • Federation Services: Provide single sign-on (SSO) capabilities across different organizational boundaries.
  • Rights Management: Protect information from unauthorized access using encryption and rights policies.

What is Microsoft Entra ID?

Microsoft Entra ID is a modern, cloud-based identity and access management service, designed to support diverse and distributed environments. It combines core directory services, application access management, and identity protection into a single solution. Microsoft Entra ID is designed to work well with modern web and mobile applications and supports integrated SaaS applications like Office 365, Salesforce, and thousands more.

Core Features of Microsoft Entra ID:

  • Single Sign-On (SSO): Users can access multiple services with one set of credentials, across cloud and on-premises environments.
  • Multi-Factor Authentication (MFA): Enhances security by requiring multiple forms of verification.
  • Device Management: Integrate with mobile device management solutions like Microsoft Intune.
  • Identity Protection and Conditional Access: Automated policies that assess risk and respond to access attempts in real time.
  • B2B and B2C Capabilities: Manage identities not just for internal users but also external partners and customers.

Key Differences Between Active Directory and Microsoft Entra ID

The primary differences between AD and Microsoft Entra ID are on their deployment environments and specific functionalities:

  • Deployment Environment: AD is tailored for on-premises use, deeply integrated into the Windows Server ecosystem, whereas Microsoft Entra ID is designed for the cloud, facilitating access to cloud apps and remote resources.
  • Management of Devices: AD manages devices connected to the corporate network or via VPN, focusing on internal network integrity. Microsoft Entra ID manages devices anywhere they have internet connectivity, reflecting a more global and mobile workforce.
  • Authentication Protocols: AD relies on traditional protocols like Kerberos and NTLM. Entra ID uses more modern protocols such as OAuth 2.0 and OpenID Connect, suitable for internet-based services.
  • Integration with Cloud Services: Entra ID offers seamless integration with cloud services like Microsoft 365, Salesforce, and many others, providing broader access management than AD.
  • Scalability: Entra ID provides greater scalability due to its cloud infrastructure, making it easier to adjust as your organizational needs change.

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How to Choose Between Active Directory and Microsoft Entra ID

Choosing between AD and Entra ID should be based on several factors:

  1. Current IT Infrastructure: If your infrastructure is primarily on-premises and you manage numerous Windows-based systems, AD is likely a good fit. If you are cloud-focused or use many cloud-based apps, Entra ID may be more appropriate.
  2. Business Requirements: Consider if your business requires integration with cloud apps, needs to support a remote or globally distributed workforce, or requires robust, scalable identity management solutions.
  3. Security Requirements: Entra ID’s advanced security features, such as Conditional Access and Identity Protection, are vital for organizations that need stringent security measures across diverse environments.
  4. Compliance Needs: If your organization operates under strict regulatory requirements, the choice might depend on which solution best meets these compliance needs, especially concerning data residency and protection.

Both Active Directory and Microsoft Entra ID offer viable solutions for managing identities and securing access to resources. The choice between the two should align with your business specific technical and business needs, as well as its strategic direction towards cloud adoption or maintaining on-premises systems. By understanding the distinct capabilities and advantages of each, you can make a well-informed decision that supports your goals and enhances your IT infrastructure’s security.

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