Spanning Tree Protocol calculates path cost based on which of these?
A.
Interface bandwidth
B.
Interface delay
C.
Interface bandwidth and delay
D.
Hop count
E.
Bridge priority
Explanation:
STP calculates the path cost based on the media speed (bandwidth) of the links between switches
and the port cost of each port forwarding frame. Spanning tree selects the root port based on the
path cost. The port with the lowest path cost to the root bridge becomes the root port. The root
port is always in the forwarding state.
If the speed/duplex of the port is changed, spanning tree recalculates the path cost automatically.
A change in the path cost can change the spanning tree topology.
Data rate and STP path cost
The table below shows the default cost of an interface for a given data rate.
