Different voltages with Ferrite Beads
You need to look a bit closer at your schematic snippett. There are two versions of the Ethernet chip, the RTL8305S and the RTL8305SB. The circuit is built with the ferrite beads for the "S" version of the chip. Alternatively the external regulator PNP circuit is used to produce the 2.5V for the "SB" version of the chip. 

The evaluation board was designed to support either version of the chip.