Answers
Once added as an expansion card
Lets smartphones join by WiFi
Usually built into computers today
Moves packets between separately owned networks
Every connected device needs one
Sits between two different networks
Usually links LAN to Internet
Crucial to how the Internet works
Forwards data only to intended device
Often powered through its Ethernet cable
Plugs into a switch by cable
Sits at the centre of a LAN
Fitted inside each computer
Connects devices together within one LAN