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  2. High-availability cluster - Wikipedia

    en.wikipedia.org/wiki/High-availability_cluster

    High-availability clusters (also known as HA clusters, fail-over clusters) are groups of computers that support server applications that can be reliably utilized with a minimum amount of down-time. They operate by using high availability software to harness redundant computers in groups or clusters that provide continued service when system ...

  3. High availability - Wikipedia

    en.wikipedia.org/wiki/High_availability

    High availability (HA) is a characteristic of a system that aims to ensure an agreed level of operational performance, usually uptime, for a higher than normal period. [ 1 ] There is now more dependence on these systems as a result of modernization.

  4. High availability software - Wikipedia

    en.wikipedia.org/wiki/High_availability_software

    Enable active/standby communication (notably Checkpointing): Active subsystems need to communicate to standby subsystems to ensure that the standby is ready to take over where the active left off. High Availability Software can provide communications abstractions like redundant message and event queues to help active subsystems in this task.

  5. Active Directory - Wikipedia

    en.wikipedia.org/wiki/Active_Directory

    Active Directory (AD) is a directory service developed by Microsoft for Windows domain networks. Windows Server operating systems include it as a set of processes and services. [1] [2] Originally, only centralized domain management used Active Directory. However, it ultimately became an umbrella title for various directory-based identity ...

  6. Domain controller - Wikipedia

    en.wikipedia.org/wiki/Domain_controller

    The software and operating system used to run a domain controller usually consists of several key components shared across platforms.This includes the operating system (usually Windows Server or Linux), an LDAP service (Red Hat Directory Server, etc.), a network time service (ntpd, chrony, etc.), and a computer network authentication protocol (usually Kerberos). [4]

  7. Multi-master replication - Wikipedia

    en.wikipedia.org/wiki/Multi-master_replication

    One of the more prevalent multi-master replication implementations in directory servers is Microsoft's Active Directory. Within Active Directory, objects that are updated on one Domain Controller are then replicated to other domain controllers through multi-master replication. It is not required for all domain controllers to replicate with each ...

  8. Microsoft Entra ID - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Entra_ID

    Microsoft Entra ID (formerly known as Microsoft Azure Active Directory or Azure AD) is a cloud-based identity and access management (IAM) solution. It is a directory and identity management service that operates in the cloud and offers authentication and authorization services to various Microsoft services, such as Microsoft 365, Dynamics 365, Microsoft Azure and third-party services. [1]

  9. History of Microsoft Exchange Server - Wikipedia

    en.wikipedia.org/wiki/History_of_Microsoft...

    Client Access Server (CAS): High availability for the Client Access Server role is provided by using Client Access Server (CAS) arrays. A CAS array can contain multiple Client Access Servers in an Active Directory site and provide a single name endpoint for client connections. CAS arrays cannot span multiple Active Directory sites.

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