The LAN card is embedded on the board, the Ethernet port input is at the backside of the NUC. In regards the driver, you just need to run Windows® 10 update, it will install the latest drivers of your device.
Now, this NUC model requires a WIFI-Bluetooth card, It is necessary to use the PCIe Mini Card Slot (Half Length) closest to the board.
The PCIe Mini Card Slot (Full Length on top) supports mSATA drives.
Tested Peripherals for Intel® NUC Boards D34010WY/D54250WY are available in the link below.