What is LDAP and how does it differ from Active Directory? It varies slightly from DAP (Directory Access Protocol) and allows searching for data, information, devices and resources in a large number of directories. The LDAP protocol is based on the rapid search or modification of a tree structure distributed over an entire server.

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Ubuntu FTP server: How to configure it?
An Ubuntu FTP server allows both downloading and sending files, each access being controlled by a separate connection. In this tutorial on the Ubuntu FTP