Only one of either may be present, depending on your computer. The tulip driver is also commonly used.
Most distributions install network startup scripts that are executed during boot.
Your network may be different, but most if not all the principles here will apply. Although it employs a Mac and modems, it will look to Linux like a normal ethernet connection to the internet. The configuration for both are described here. Below is the network with locally assigned IP addresses. If you skipped the LAN setup in the R4 install or R5 install procedure , this page may help you set it up manually.