Which two values are used by Spanning Tree Protocol to elect a root bridge? (Choose two.)

A.
bridge priority

B.
IP address

C.
MAC address

D.
IOS version

E.
amount of RAM

F.
speed of the links

Explanation:
Two values are compared to elect a root bridge in STP: bridge priority and MAC address.
Switch having lowest bridge ID will become the root bridge. The bridge ID is how STP keeps track
of all the switches in the network. It is determined by a combination of the bridge priority (32, 768
by default on all Cisco switches) and the base MAC address. The bridge with the lowest bridge ID
becomes the root bridge in the network.