Can I use this ethernet header with arduino?

Using Arduino Networking, Protocols, and Devices
1

Can I use this simple ethernet pcb header with arduino by just plugging it into a breadboard and routing the pins to the arduino digital pins?

http://www.ebay.com/itm/1pcs-RJ45-PCB-JACK-CAT5-5E-6-10PIN-CONNECTOR-modular-network-plug-cable-ethernet-/301147774951?pt=US_Surveillance_Cables_Adapters_Connectors&hash=item461dce5fe7

2

No you wouldn't. You need to purchase a shield or adapter... They can be had for as little as $5usd to $10usd.

3

So like this one right: http://www.ebay.com/itm/1-2PCS-ENC28J60-Ethernet-LAN-Network-Module-Schematic-Arduino-SPI-AVR-PIC-LPC-/251472502315?pt=LH_DefaultDomain_2&var=&hash=item3a8cedde2b

Also, out of curiosity, what does the shield do exactly other than break out the pins. What does the IC on it do?