At which layer of the OSI model does the Spanning Tree Protocol (STP) operate at?

A.
Layer 5

B.
Layer 4

C.
Layer 3

D.
Layer 2

E.
Layer 1

Explanation:
Spanning-Tree Protocol (STP) is a Layer 2 (L2) protocol designed to run on bridges and switches. The
specification for STP is called 802.1d. The main purpose of STP is to ensure that you do not run into a
loop situation when you have redundant paths in your network. Loops are deadly to a network.