Sample Network Diagram for Small Office

Access Point
Normally, the access points allow the users to connect the Internet through the Wired Network(Switch, Router, Modem, etc....).

Switches
The switch (layer 2) normally receive the packets, process it and forward data to the destination.


Routers
Normally, the router is used to connect the different networks. But there are so many router functions if detailed.


Modem
The Modem is the common networking device that turns the digital data of an electronic device into modulated electrical signal for transmission over telephone lines and demodulated by another modem at the receiver side to recover the digital data.


Internet
The Internet is the global system of interconnected computer networks that use the Internet Protocol Suite (TCP/IP) to link billions of devices worldwide.