Access Control List – ACL’s are used to specify who has access to what resources. Typically they are applied at either the network or file system level. Example: A network ACL may specify that users on the 10.1.1.0/24 subnet has access to NFS Shares on server1 whereas a file system ACL may specify that user1 can read and execute the files in folder1, but cannot delete the files.
A Database integrated into Microsoft Windows Domain controllers used for tracking and authenticating User and Computer accounts on a Network. Active Directory also tracks Configuration and Identity Information for Users, Computers and Applications within a given Domain.