Active Directory (AD) is a directory service which provides a centralized platform for managing and authenticating users, computers, and resources within a domain. AD enables administrators to enforce policies, deploy software, and manage security settings across the network, offering hierarchical organizational units, Group Policy management, and flexible authentication mechanisms.

Active Directory (AD) Advanced service includes designing, implementing, and managing Active Directory environments on multi-server (upto 4) implementation of PDC and ADC at datacenter, near datacenter and disaster recovery sites with complete automated failover and balancing. AD Advanced Service includes the features tasks to be performed. 
Installation of Primary and Additional Domain Controller in DC
Installation of Addtional Domain Controller in Near DC (if required)
Installation of Additional Domain Controller in Disaster Recovery Site 
Configuration of Site and Services
Security Hardening to meet the compliance requirement 
Remote Software Installation
Integrate Wifi Authentication
Includes Client Migration upto 50 Users
Free Orientation to System Administrators
Free 60 days support on server side

(Note: Server licenses are not included in the package).