connect computers, within same office or building, into a network that allows users access to shared resources, such as files stored on dedicated computers - servers, printers, mail servers, and others.

routers

connect your LAN directly to Internet or to other LANs using VPN or other methods.

firewalls

protect your network from intrusions and to control access to the Internet.

email

Setup and configuration for e-mail client software on desktops, and mail services on the servers.

web servers

Installation and configuration of web services on the servers.