Ok my Network Port thing looks like this

, its smaller then the Ethernet one.
Ok I'll post all the stuff I have to work with
-modem has 3 slots ones for Modem to USB the other is Ethernet to computer or router and the last one is smaller Ethernet thing to my Phone which connects me to the net.
-Cords lots of Ethernet and small Ethernet cords.
-Each computer has that Network slot same Size.
-Main computer has a Ethernet port for the router to modem thing
-Firewalls are not a problem they are not handicapped ones.
I may have to buy a Ethernet to small Ethernet adapter but I'm not sure.