Networks 101

Local Area Network (LAN) Topology 

It Starts with the Modem. 

Here's the Internet. So what you want with it.

If there's more than 1 Ethernet Port, it might have an internal Router. So be careful. 

To Route IP Traffic and Broadcasting Wi-Fi

Then down to the peripherals.

VoIP Phones 

Wi-Fi is the wireless infrastructure for IoT devices 

Say it loud, say it proud 

For redundancy, In case your primary internet goes down.