Ethernet W5100 Network Shield allows an Arduino board to connect to the internet. It is based on the Wiznet W5100 ethernet chip. Wiznet W5100 provides a network stack capable of both TCP and UDP. It supports up to four simultaneous socket connections. Use the Ethernet library to write sketches which connect to the internet using the shield.
Ethernet W5100 Network Shield now includes a micro SD card connector, it is Arduino Mega compatible and has an on-board reset controller.
Ethernet W5100 Network Shield connects to an Arduino board using long wire-wrap headers which extend through the shield. This keeps the pin layout intact and allows another shield to be stacked on top.
Arduino uses digital pins 10, 11, 12, and 13 (SPI) to communicate with the W5100 on the ethernet shield. These pins cannot be used for general i/o.
Ethernet W5100 Network Shield Schematic
Ethernet W5100 Network Shield Quick Start Guide: http://arduino.cc/en/Guide/ArduinoEthernetShield