When a switch has multiple links connected to a downstream switch, what is the first step that STP takes to prevent loops?

When a switch has multiple links connected to a downstream switch, what is the first step that STP takes to prevent loops?
A . STP elects the root bridge
B . STP selects the root port
C . STP selects the designated port
D . STP blocks one of the ports

View Answer

Answer: A

Explanation:

First when the switches are powered on all the ports are in Blocking state (20 sec), during this time the + Root Bridge is elected by exchanging BPDUs

+ The other switches will elect their Root ports

+ Every network segment will choosee their Designated port

Source: https://learningnetwork.cisco.com/thread/7677