Refer to the exhibit.

Which switch is designated as the root bridge in this topology?

A.
It depends on which switch came on line first.

B.
Neither switch would assume the role of root bridge because they have the same default
priority.

C.
switch X

D.
switch Y

Explanation:
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_configuration_example09186a008009
467c.shtml
Rules of Operation
This section lists rules for how STP works. When the switches first come up, they start the root
switch selection process. Each switch transmits a BPDU to the directly connected switch on a perVLAN basis.
As the BPDU goes out through the network, each switch compares the BPDU that the switch
sends to the BPDU that the switch receives from the neighbors. The switches then agree on which
switch is the root switch. The switch with the lowest bridge ID in the network wins this election
process.