A Router is a small device that sits between a modem and a computer with the function to take the information from the modem and deliver it from the modem to a computer or multiple computers in the network (usually for internet connection).
What is an Intranet?
A local or restricted private network which is personally owned to an individual, to an organization or to a group.
What is a switch and what does it do?
A switch is a device that channels incoming data from multiple input ports to a specific output port and it will take the data to its destination
What is a proxy and what does it do?
A point to point connection between the user and the remote location on the internet. This connection provides a tunnel through which all further communication will pass.