Active Directory (AD) is a directory service implemented by Microsoft for Windows domain networks. It provides a logical and a consistent database that stores the configuration information about the network and all network based resources users, computers, files, printers, applications, shares etc.

1. Network and System Administration
Assignment: Designing Active Directory logical structure with diagram
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Abstract
Active Directory (AD) is a directory service implemented by Microsoft for Windows domain
networks. It provides a logical and a consistent database that stores the configuration
information about the network and all network based resources - users, computers, files,
printers, applications, shares etc. It plays an extremely important role in managing these
network resources efficiently. It helps in defining the universal policies for all the resources
in the domain from one secure, centralized location
It also plays an important role in securely authenticating the network users and resources
prior to giving them access to these resources and manage the identities and relationships
between them. (California Institute of Technology). When a computer joins a domain, the
security settings as well as the domain configurations are pushed onto the new computer with
the help of an Active Directory Server (Wikipedia). On the other hand, when a user logs into
a computer that is part of a Windows domain, he is authenticated at the Active Directory
server and depending upon his authorization level, access privileges of the users are decided.
Active Directory makes use of Lightweight Directory Access Protocol (LDAP) to implement
the directory services and Kerberos Authentication Protocol for verifying the user’s identity.