Ethernet phy connection: grounding between chassis, connector and IO
It is typical for the Ethernet Center Taps to be connected through a 75 ohm resistor (one per center tap) and then all of them connected through a 0.01 to 0.1 uF 2-4KV cap to chassis gnd.  I am not 100% sure, but it might even be part of the Ethernet spec to do it that way.  

The other caps and bead between chassis GND and signal GND is done that way more out of ignorance or CYA than anything else "real".  It is common to see people put those components in the schematics and then figure out how to best populate them during EMI testing.  But, simply put, these components are not there because of Ethernet.