The Ethernet controller is typically the Realtek RTL8101L (10/100 Mbps). Some premium OEM revisions use the RTL8111B , which supports Gigabit (10/100/1000 Mbps). To identify yours, look for the IC near the USB/LAN ports.
In the world of computer hardware, few things are as frustrating as trying to find specifications for a component that bears a cryptic code. If you have opened up an older desktop computer—perhaps an HP, Compaq, or Lenovo—and spotted the string "N15235" stamped on the motherboard, you are likely looking for upgrade options or repair details. foxconn n15235 motherboard specifications