Explain the function and configuration of at least four-fifths of all required network devices, citing specific, credible sources. Mention the function and configuration of the following network devices: Authentication server (Microsoft Active Directory), Routers, switches, and/or hubs, Local and remote users, Workstations, File share (CIFS), Mail server, Web servers (both internal and external), Firewalls, Internet cloud, Web proxy, E-mail proxy, FTP server (for internal-to-external transport).