CAN connection on roboRio.

[Zentx]

This is my first year on the Robotics team. I have familiarized myself with the RJ12-Serial connection for the CAN BUS on the cRio.
I was wondering how CAN will work on the new roboRio with Jaguars, since there is no serial port.
Do I only use the CAN - H and CAN - L wires of the RJ12 cable and connect it to the RoboRio?
Should I use a a different gauge wire to connect the wires to the roboRio? If so, would it cause bottle-necking?
Would I need a terminating resistor on the roboRio, or does it act like one itself?

Thanks.