This is the ultimate FAQ for Microsoft Active Directory \u2014 built to answer all of the most frequently asked questions about the legacy, on-prem directory service. We\u2019ll get into the what, when, why, who, and how of Microsoft Active Directory \u2014 otherwise known as AD. <\/p>\n\n\n\n
AD is both widely used and widely misunderstood. Developed by Microsoft in the late 1990s, AD is the world\u2019s most well-known on-prem directory service and is often referred to as an identity provider (IdP). AD ushered in the era of modern identity management in the early 2000s, but with today\u2019s shifting IT landscape there are a number of questions that IT admins and organizations have about what AD is, how it works, and why it matters. <\/p>\n\n\n\n
Microsoft has extended AD, which it now considers to be a legacy product, from the LAN to the web with an assortment of services for user, device management, and security. This hybrid cloud paradigm expands its ecosystem with an emphasis on directing users to even more Microsoft\u2019s technologies while retrofitting its local LAN solution for the WAN.<\/p>\n\n\n\n
We\u2019ve identified some of the most common questions about Microsoft\u2019s approach to Active Directory device management<\/a> identity management and answer them below. It includes guidance on how to modernize AD to meet new requirements.<\/p>\n\n\n\n
Modernize Your Infrastructure<\/p>\n\n\n\n
See why an open directory platform can help you to unify your environment<\/a>.<\/p>\n\n\n\n
Active Directory is a directory service\/identity provider that enables administrators to connect users to Windows-based IT resources. Further, with AD, IT can manage and secure their Windows-based systems and applications. AD stores information about network objects (e.g., users, groups, systems, networks, applications, digital assets, and many other items) and their relationship to one another.<\/p>\n\n\n\n
Admins can use AD to create users and grant them access to Windows laptops, servers, and applications. They can also use AD to control groups of systems simultaneously, enforcing security settings and software updates.<\/p>\n\n\n\n
Access and controls are enabled using the concept of a domain. The domain concept is essentially a concept of inclusion and exclusion. Traditionally, this approach was leveraged for physical locations. Historically, many IT resources were hosted on-prem and were a part of the domain \u2014 i.e., internal network \u2014 and when a user was in the physical location they would have access to all of their requisite resources on-prem. If a user was off-prem, they would need a VPN to make it appear that they were on-prem. This approach worked well when IT resources and people were in the same physical proximity.<\/p>\n\n\n\n
AD is part of the wider identity and access management (IAM) space and is often supplemented with single sign-on (SSO) or mobile device management (MDM) solutions among many others. JumpCloud Directory Platform is a cloud-based alternative<\/a> to Active Directory.<\/p>\n<\/div><\/div><\/div>\n\n\n\n
Check out our AD to Cloud “translation” guide<\/a>. The guide is a Rosetta stone to help you understand the concepts and terms that are specific to AD and the cloud.<\/p>\n<\/div><\/div><\/div>\n\n\n\n
Microsoft first introduced the world to Active Directory in 1999 and released it alongside Windows\u00ae<\/sup> 2000 Server edition. <\/p>\n<\/div><\/div><\/div>\n\n\n\n
Active Directory takes advantage of the networking protocols for DNS\/DHCP and the Lightweight Directory Access Protocol (LDAP), alongside Microsoft\u2019s proprietary version of Kerberos<\/a> for authentication within internal networks (LANs). Kerberos was considered secure when it was introduced during the late 1990s, but it\u2019s now vulnerable to attack methods involving Kerberoasting<\/a>, forged tickets, and stolen tickets. That means spending a lot of time and resources for mitigations and security controls to improve security. Failure to do so may place valid account credentials at risk.<\/p>\n\n\n\n
Many people ask why AD doesn\u2019t natively support more modern protocols, such as SAML, OIDC, and RADIUS. We won\u2019t speculate on their reasoning, but we do believe that a multi-protocol approach is the future of cloud IAM architecture<\/a>. Support for protocols such as SAML, OIDC, and RADIUS can be accomplished through Microsoft add-on solutions as well as third-party solutions.<\/p>\n<\/div><\/div><\/div>\n\n\n\n
Our best guess is that AD is called \u201cActive\u201d Directory because it actively updates information stored in the directory. For example, when an administrator adds or subtracts a user from the organization, Active Directory automatically replicates the change to all of the directory servers. This happens at a regular interval so that the information always remains up to date and synchronized.<\/p>\n\n\n\n
Today, this \u201cactive\u201d type of behavior is expected in IT systems. But, before the era of computerized directory services, the concept of a directory that kept itself up to date was pretty innovative. Keep in mind that when the Active Directory moniker was coined, physical encyclopedias were still commonly used and the \u201cactive\u201d Wikipedia hadn\u2019t yet launched.<\/p>\n<\/div><\/div><\/div>\n\n\n\n
Generally speaking, when an organization leverages Active Directory, every single employee uses Active Directory every day without even knowing it. People use Active Directory when they log in to their work machines and when they access apps, printers, and file shares.<\/p>\n\n\n\n
But the primary users of Active Directory are the admins who operate, manage, and configure AD. AD admins likely include all of the IT team and may also include members of the organization\u2019s security, DevOps, or engineering teams.<\/p>\n\n\n\n
Virtually all organizations around the world use a solution such as Active Directory or other identity provider. Enabling and controlling access to IT resources is one of the most important aspects of operating and securing an organization. Solutions such as directory services enable organizations to be productive.<\/p>\n<\/div><\/div><\/div>\n\n\n\n
Whether people realize it or not, Active Directory has been making the business world go \u2018round since the turn of the century. AD is in place at almost every large organization and many small ones. It\u2019s a legacy foundational tool that hums away quietly in the background, so many people who use AD every day don\u2019t even realize what it is \u2014 the secure access key to their laptops, applications, network, and files. In short, a directory service is what connects users to their IT resources, and AD has done that for users to their Windows resources for almost two decades.<\/p>\n\n\n\n
Looking for a more in-depth answer? We have a blog that covers the purpose of Active Directory<\/a>. <\/p>\n<\/div><\/div><\/div>\n\n\n\n
An object is the generic term for any unit of information stored within Active Directory\u2019s database. Objects can include users, laptops, servers, and even groups of other objects (explained below). <\/p>\n<\/div><\/div><\/div>\n\n\n\n
AD enables admins to manage sets of multiple objects known as groups. Using GPOs (group policy objects)<\/a>, an admin can make a change to one group and have that change apply to all objects within that group. They\u2019re often used to segment users or systems by department or clearance.<\/p>\n\n\n\n
A forest is at the top of Active Directory\u2019s logical structure, which also includes objects, trees, domains, and organizational units (OU). A forest describes a collection of trees, which denote a collection of domains. So, what are trees and domains? <\/p>\n\n\n\n
Well, a domain is a collection of users, computers, and devices that are part of the same Active Directory database. If an organization has multiple locations, they may have a separate domain for each one. For example, an international organization could have a domain for their London office, another one for their New York office, and a third one for their Tokyo office. IT admins also sometimes isolate their user accounts into a separate forest to maximize security. These configurations aren\u2019t rudimentary and oftentimes require hiring external resources to set up.<\/p>\n\n\n\n
A tree could be used to group all three of those domains as branches belonging to the same tree, so to speak. An organization that has multiple trees could then group them into a forest.<\/p>\n\n\n\n
This is a core concept of Active Directory and it can be complicated. If you have questions, drop us a note<\/a> and we\u2019d be happy to help you work through what type of AD structure makes the best sense for your organization. Meanwhile, check out the Active Directory to cloud translation guide<\/a> for additional context and definitions.<\/p>\n<\/div><\/div><\/div>\n\n\n\n
A domain controller<\/a> (DC) is any server that is running Active Directory Domain Services (AD DS). At least one domain controller is necessary to use Active Directory, though most organizations have at least two per location. Large, multinational organizations may require dozens of domain controllers across each of their physical locations in order to ensure high availability for their AD instance. <\/p>\n\n\n\n
Note that Microsoft has also extended the concept of a domain to Azure. Organizations can create a separate domain at Azure through Active Directory Domain Services (AD DS). This domain is separate and distinct from the on-prem domains, although the two can be bridged through a variety of connective technology including Azure AD Connect and Azure AD. AAD is, however, a separate directory service from the legacy on-premises directory. It\u2019s not possible to access Microsoft services such as Microsoft 365\u2122 (M365) without AAD if your existing directory resides in AD. <\/p>\n\n\n\n
Microsoft has also branched into mobile device management (MDM) and premium identity management services through its SKUs. Likewise, those are dependent upon AAD.<\/p>\n\n\n\n
Gated Licensing Structure<\/strong><\/p>\n\n\n\n
Microsoft has implemented a gated licensing scheme for AAD services. For instance, there are two distinct subscription levels for AAD Premium; and other services for MDM, advanced identity management, and Zero Trust security policies are either included or available as separate subscriptions.<\/p>\n\n\n\n
IT organizations often work with partners to navigate this web. We should also note that there is a new concept called the Domainless Enterprise<\/a>, which takes the approach of eliminating the domain concept, but still retains the idea of securely and frictionlessly accessing IT resources wherever they may be through an open directory platform. This concept is especially helpful for organizations that leverage web applications, cloud infrastructure, and non-Windows platforms (e.g., macOS, Linux).<\/p>\n<\/div><\/div><\/div>\n\n\n\n
AD DS basically sets up the database of objects that serves as the foundation for AD management. AD DS isn\u2019t the only server role associated with Active Directory, but you could argue that it\u2019s the server role that corresponds most directly to the core functionality that people associate with AD. <\/p>\n<\/div><\/div><\/div>\n\n\n\n
Technically, yes, Active Directory can work for Macs<\/a>. But the user and system management capabilities of AD are curtailed with Macs when compared to the functionality with Windows systems. Deep, automated control over Mac systems has conventionally been achieved only with the help of third-party directory extensions or MDMs (mobile device managers). Tight control over users including provisioning, deprovisioning, and permission modifications are also challenging on Macs when using AD. Microsoft provides Mac MDM for an additional cost.<\/p>\n\n\n\n
We\u2019ve put together a resource on this topic called best practices for integrating Macs with Active Directory<\/a>.<\/p>\n<\/div><\/div><\/div>\n\n\n\n
Knowing how to use AD is a valuable skill \u2014 and one that\u2019s broadly applicable at organizations worldwide. Learning AD is particularly valuable if you want to work in IT supporting Windows devices, Azure cloud services, SharePoint, and many other enterprise softwares and platforms. <\/p>\n\n\n\n
However, it is possible to advance a career in IT without ever learning AD.
Modern, cloud-forward organizations are bypassing on-prem AD altogether and going straight to cloud-based directory services. You can practice with directory services by taking advantage of a free JumpCloud Directory Platform <\/a>account. JumpCloud University<\/a> can also help you learn the concepts around a cloud directory platform and the domainless enterprise.<\/p>\n<\/div><\/div><\/div>\n\n\n\n