Answer:
Any of the following:
1. Root Guard
2. BPDU Guard
3. BPDU Filtering
Explanation:
Given that STP an acronym of Spanning Tree Protocol, and its major purpose is to stop the bridge loops and the broadcast radiation that emanates from its topology.
Cisco carried out three instruments or tools to protect the STP topology. These protection tools accompany the STP, and they are the following:
1. Root Guard
2. BPDU Guard
3. BPDU Filtering
