If you are thinking or want to use Arduino Ethernet Shield 05 ([url]http://www.arduino.cc/en/Main/ArduinoEthernetShield[/url]) on FEZ(Domino and Panda).
Since the Shield did not provided the traces to SPI on pin D11, D12, and D13 because they want to make the shield to be compatible with both Arduino and MEGA.
So you need to modify the shield in order to be used with FEZ(Domino or Panda)
Here is the link to the instruction of how to modify the Shield to use with FEZ Domino or Panda.