DNS – https://en.m.wikipedia.org/wiki/Domain_Name_System
ISP – https://en.m.wikipedia.org/wiki/Internet_service_provider
DHCP –https://en.m.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol
Pfsense –
Router –https://en.m.wikipedia.org/wiki/Router_(computing)
Modem – https://en.m.wikipedia.org/wiki/Modem
Switch –https://en.m.wikipedia.org/wiki/Network_switch
Firewall – https://en.m.wikipedia.org/wiki/Firewall_(computing)