Connection Types
Ethernet
Ethernet connections refer to regular Ethernet connections, such as connections to DSL, Cable Modems or local area networks. This does not refer to PPPoE, event though PPPoE connections use the same cable connections.
Dialup Modem
Dialup Modem or PPP connections refer to traditional telephone dialup connections over PPP.
PPPoE
PPPoE connections refer to internet connections that use PPP Over Ethernet, used for some DSL, ADSL and Cable Modem connections.
Airport
Airport cards and the second network card on a multihomed Mac are referred to collectively as Airport cards.