{"id":71040,"date":"2022-11-02T11:30:00","date_gmt":"2022-11-02T15:30:00","guid":{"rendered":"https:\/\/jumpcloud.com\/?p=71040"},"modified":"2024-05-09T12:39:06","modified_gmt":"2024-05-09T16:39:06","slug":"domain-controller-vs-active-directory","status":"publish","type":"post","link":"https:\/\/jumpcloud.com\/blog\/domain-controller-vs-active-directory","title":{"rendered":"Domain Controller vs. Active Directory"},"content":{"rendered":"\n
Active Directory (AD)<\/a> and a domain controller<\/a> are some of the IT components that are core to organizations using Windows operating systems (OSs). But what\u2019s the difference between them? <\/p>\n\n\n\n Active Directory is Microsoft\u2019s proprietary directory service, and has been designated as a legacy product<\/a>. It allows IT teams to manage identities and control access to PC-centric resources throughout enterprise networks. <\/p>\n\n\n\n A domain controller, on the other hand, is a server that responds to user authentication requests, allowing the host to access various resources on an enterprise network.<\/p>\n\n\n\n In this post, we\u2019ll explore the differences between a domain controller versus Active Directory, and how JumpCloud can help you to modernize AD or ditch the domain controller altogether. It also includes an informative FAQ.<\/p>\n\n\n\n Active Directory is an identity management database that allows IT teams to define what users can do on a network. As a database, Active Directory captures data in the form of objects. An object can be a single resource element, like a user, group, application, or device. <\/p>\n\n\n\n Each object has associated attributes that allow it to be distinguished from other entities. For example, a user object would have a username, password, and email attributes that distinguish it from other objects.<\/p>\n\n\n\n It\u2019s important to know that AD has been designated as a legacy product in Microsoft\u2019s publications<\/a> and in communications from its team members. Microsoft advises its customers to layer multiple cloud services around AD in order to monitor and protect it. That includes managing identities with premium tiers of Entra ID and a separate subscription for Defender for Identity.\u00a0<\/p>\n\n\n\n Other core parts of the Windows Server stack have already made the jump to the cloud: Exchange, aka Exchange Online, and Windows Server Update Services (WSUS), which is now Configuration Manager. Configuration Manager is optimized for cloud co-management<\/a>, which \u201cunlocks\u201d features such as conditional access<\/a> that Microsoft says are essential to protect users.<\/p>\n\n\n\n Microsoft\u2019s prescribed pathway to AD modernization has several major drawbacks.<\/p>\n\n\n\n Those include:<\/p>\n\n\n\n Active Directory consists of four essential services that allow it to provide identity and access management<\/a>:<\/p>\n\n\n\n This is the main service within the Active Directory protocol. Besides storing the directory information, it also controls which users can access each enterprise resource and group policies. AD DS<\/a> uses a tiered structure comprising the domains, trees, and forests to coordinate networked resources.<\/p>\n\n\n\n It shares the same codebase and functionality as AD DS. However, unlike AD DS, AD LDS uses the Lightweight Directory Access Protocol<\/a> (LDAP), allowing it to run on multiple instances on the same server. <\/p>\n\n\n\n As the name suggests, AD FS<\/a> is a federated identity service that provides single sign-on<\/a> (SSO) capabilities. It uses many popular protocols such as OAuth<\/a>, OpenID<\/a>, and Secure Assertion Markup Language<\/a> (SAML) to pass credentials between different identity providers. AD FS remains supported, but more modern functionality and some AD FS capabilities are now included in Microsoft\u2019s Entra ID cloud directory subscription services.<\/p>\n\n\n\n This is a service that creates on-premises public key infrastructure (PKI)<\/a>, allowing organizations to create, validate, and revoke certificates for internal use. Microsoft is now providing an add-on paid subscription service to its Intune product line for this purpose.<\/p>\n\n\n\n A domain controller is a server that processes user authentication requests on a particular domain on an enterprise network. While domain controllers are primarily used in AD domains, you can also use them with other non-Windows IAM systems, such as Samba<\/a> and FreeIPA<\/a>.<\/p>\n\n\n\n A domain controller restricts access to enterprise resources within a given domain by authenticating and authorizing users based on their login credentials. For example, in Windows domains, the domain controller obtains authentication information for user accounts from Active Directory. <\/p>\n\n\n\n While domain controllers can operate as single systems, they are often implemented in clusters to provide high availability (HA) and reliability services. For example, in Windows Active Directory, each cluster can consist of a primary domain controller (PDC) and a backup domain controller (BDC). In Unix and Linux ecosystems, replica domain controllers replicate authentication databases from the PDC.<\/p>\n\n\n\n It\u2019s common to think that the terms Active Directory and domain controller are synonymous. This is because domain control is a function within Microsoft\u2019s Active Directory, and domain controllers are servers that leverage AD to validate and respond to authentication requests. <\/p>\n\n\n\n However, the terms are not interchangeable. Active Directory is a database that stores and organizes enterprise resources as objects. You can think of Active Directory as a database that stores users and device configurations in AD DS. A domain controller, in contrast, is simply a server running Active Directory that authenticates users and devices. In this regard, you can think of a domain controller as a custodian, facilitator, or host of Active Directory. <\/p>\n\n\n\n Since domain controllers mediate all access to the network resources, it is essential to protect them with additional security mechanisms, such as firewalls, encryption protocols, and expedited configuration and patch management solutions.<\/p>\n\n\n\n Many organizations are looking to implement SSO solutions<\/a> that allow their employees to access all their on-prem and cloud-based applications easily.\u00a0<\/p>\n\n\n\n In the recent past, a vital requirement of these solutions was the domain controller, which made it possible to connect applications back to Active Directory as a single source of truth. Organizations have used AD FS as a solution for integrating Active Directory into cloud-based applications. However, while Microsoft markets AD FS as a \u201cfree\u201d solution, there are many hidden costs, including hardware purchase, deployment, and ongoing maintenance, that you have to contend with. <\/p>\n\n\n\n But what constitutes a complete IAM solution is very different today. Such a solution should provide automated provisioning of resources, lifecycle management, mobile device management (MDM<\/a>), and reporting from a single console. The IAM solution should also be vendor-agnostic, unlike Active Directory, which excels at managing access to on-prem Windows-based OSs. The IT environments of today simply don\u2019t look like that anymore.<\/p>\n\n\n\n The JumpCloud Directory Platform\u00ae<\/sup> is a cloud-based directory management solution that simplifies AD integration, allowing IT teams to unify IAM and consolidate tooling while modernizing Active Directory for greater IT efficiency and flexibility. Organizations can also leverage JumpCloud as an AD replacement<\/a> tool, reducing the on-prem servers required to set up AD FS and moving to a domainless enterprise<\/a>.<\/p>\n\n\n\n AD modernization<\/a> is important, no matter where you land on that journey. There\u2019s more than one way to accomplish it, and Microsoft\u2019s way may not be what\u2019s best for you. Get started with a trial<\/a> today, or contact us<\/a> to discuss your needs and how JumpCloud can help.<\/p>\n\n\n\n No, Active Directory is a directory service that stores information, whereas a domain controller is a server that runs Active Directory and is responsible for authenticating users and enforcing security policies within the domain.<\/p>\n\n\n\n Yes, a network can have multiple domain controllers for high availability. Having multiple domain controllers provides fault tolerance and ensures network availability even if one domain controller fails. Changes to Active Directory are replicated between domain controllers to keep the information consistent. Cluster-aware updating is used to update the cluster nodes.<\/p>\n\n\n\n No, Active Directory is a Microsoft technology and can only be installed on Windows Server operating systems.<\/p>\n\n\n\n Yes, Active Directory supports multi-domain environments. It can manage multiple domains within a forest, and trust relationships can be established between domains to allow resource access across domains. This requires following security best practices, selecting the appropriate trust relationship(s), avoiding single points of failure, and having the appropriate security controls so that attackers cannot move laterally across domains. You also want to ensure that your environment isn\u2019t too complex to manage.<\/p>\n\n\n\n A domain controller uses the authentication protocol Kerberos to verify the identity of users and computers within the domain. When a user attempts to log in, the domain controller checks the credentials against the Active Directory database before granting access to network resources. <\/p>\n\n\n\n Windows NT LAN Manager (NTLM) authentication is also still supported by Microsoft, but is in the process of being phased out in favor of Kerberos.<\/p>\n\n\n\n Yes, a domain controller can be either a physical server or a virtual machine run on premises or in the cloud. As long as it meets the hardware requirements and runs a compatible Windows Server operating system, it can function effectively as a domain controller.<\/p>\n\n\n\n Promoting a server to a domain controller involves installing the Active Directory Domain Services role, running the Active Directory Domain Services Configuration Wizard, selecting the appropriate options, and defining the domain configuration. You may add your new domain controller to an existing domain for high availability. This work should be performed from a secure workstation while using temporarily elevated access for global admin rights.<\/p>\n\n\n\n The Global Catalog is a distributed data repository in a domain controller that contains a partial replica of all objects from all domains within the Active Directory forest. It allows for efficient searching and authentication across the forest.<\/p>\n\n\n\n Group policies in Active Directory allow administrators to control user and computer configurations across the domain. The domain controller replicates and enforces these policies to all machines within its domain, ensuring consistent settings and security measures.<\/p>\n\n\n\n While a domain controller can function independently for a limited time, it requires network connectivity to provide essential services like user authentication, access to resources, and replication with other domain controllers for full functionality.<\/p>\n\n\n\n You can monitor domain controllers using tools like Windows Server\u2019s Event Viewer and Performance Monitor. Regularly check for critical events, performance metrics, and ensure replication between domain controllers is functioning correctly. Some organizations also utilize security information and event management (SIEM) and other security services. <\/p>\n\n\n\n Domain controllers play a crucial role in network security by enforcing user access controls, implementing group policies, facilitating secure communication through encryption, and ensuring the integrity and availability of Active Directory data.<\/p>\n\n\n\n First, consider the physical security of your servers and establish procedures to restrict access. Implement role-based separation of duties, such as Shielded VMs in Hyper-V Secure, if you collocate less sensitive virtual machines on the same physical infrastructure. <\/p>\n\n\n\n Secure the control plane by following guidance to reduce the attack surface area through configuration management. Microsoft\u2019s documentation on securing privileged access<\/a> is helpful for those purposes. Limit internet access by using policies to restrict web browsing from your domain controllers.\u00a0<\/p>\n\n\n\n Privileged users should ideally be issued just-in-time rights for privileged access to production servers and reside in a secure bastion forest to avoid granting attackers untethered access to domain-joined IT infrastructure. Only run currently supported versions of Windows Server (upgrading domain and forest functional levels) and adopt a patch management strategy to control vulnerabilities. <\/p>\n\n\n\n Also, secure Active Directory Federation Services (AD FS) if it\u2019s part of your environment. Larger organizations will monitor for signs of compromise and scan for known vulnerabilities.<\/p>\n\n\n\n Active Directory maintains data consistency through multi-master replication. Each domain controller holds a writable copy of the Active Directory database, and changes made to one domain controller are replicated to others within the domain.<\/p>\n\n\n\n Yes, a domain controller can hold multiple roles known as Flexible Single Master Operations (FSMO) roles. These roles include Schema Master, Domain Naming Master, PDC Emulator, RID Master, and Infrastructure Master. However, domain controllers should have a limited number of roles installed on them. Security risks increase when more software is running. Windows Server Core is an installation option that will reduce the attack surface area.<\/p>\n\n\n\n The Global Catalog stores a partial replica of all objects in the forest, enabling efficient searches across domains and providing universal group membership information during user authentication.<\/p>\n\n\n\n To remove a retired or decommissioned domain controller, you should demote it using the DCPROMO utility or by using PowerShell<\/a> and then following the appropriate removal workflow. This ensures that Active Directory is aware of the changes and avoids potential issues with metadata. Follow best practices to ensure that all of the FSMO roles have been transferred to other servers and the global catalog isn\u2019t impacted by the demotion.<\/p>\n\n\n\nActive Directory: Identities and Access<\/h2>\n\n\n\n
The Cost of AD as a Legacy Product<\/h3>\n\n\n\n
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The Four Essential AD Services<\/h2>\n\n\n\n
Active Directory Domain Services (AD DS)<\/h3>\n\n\n\n
Active Directory Lightweight Directory Services (AD LDS)<\/h3>\n\n\n\n
Active Directory Federation Services (AD FS)<\/h3>\n\n\n\n
Active Directory Certificate Services (AD CS)<\/h3>\n\n\n\n
Domain Controller: Validate and Authenticate<\/h2>\n\n\n\n
Active Directory vs. Domain Controller<\/h2>\n\n\n\n
Deciding What You Need for a Directory and Domain Controller<\/h2>\n\n\n\n
Modernize AD<\/h2>\n\n\n\n
Active Directory & Domain Controller FAQ<\/h2>\n\n\n\n
Are domain controllers and Active Directory the same thing?<\/h3>\n\n\n\n
Can a network have multiple domain controllers?<\/h3>\n\n\n\n
Can Active Directory be installed on a non-Windows server?<\/h3>\n\n\n\n
Does Active Directory support multi-domain environments?<\/h3>\n\n\n\n
How does a domain controller handle user authentication?<\/h3>\n\n\n\n
Can a domain controller be a physical or virtual server?<\/h3>\n\n\n\n
What is the process of promoting a server to a domain controller?<\/h3>\n\n\n\n
What is the Global Catalog in a domain controller?<\/h3>\n\n\n\n
How does a domain controller handle group policies?<\/h3>\n\n\n\n
Can a domain controller operate independently without a network connection?<\/h3>\n\n\n\n
How can I monitor the health of domain controllers?<\/h3>\n\n\n\n
How do domain controllers contribute to network security?<\/h3>\n\n\n\n
What are some best practices to enhance domain controller security?<\/h3>\n\n\n\n
How does Active Directory ensure data consistency across domain controllers?<\/h3>\n\n\n\n
Can a domain controller be assigned multiple roles in Active Directory?<\/h3>\n\n\n\n
What is the purpose of the Global Catalog in Active Directory domain controllers?<\/h3>\n\n\n\n
What is the process of removing a retired or decommissioned domain controller from Active Directory?<\/h3>\n\n\n\n