To which destination MAC address are standard STP BPDUs sent?

Standard Spanning Tree Protocol (STP) Bridge Protocol Data Units (BPDUs) are sent to the multicast MAC address 01-80-C2-00-00-00. This multicast address is specifically reserved for the STP protocol and is a part of the Ethernet protocol standard for sending out control messages essential for managing bridges and switches in a network.

When an STP network environment is established, BPDUs play a crucial role in preventing loops, maintaining the topology of the network, and stewarding the connectivity of switches. By sending BPDUs to this multicast address, all switches that participate in the spanning tree can receive necessary protocol information, ensuring synchronization and efficient loop prevention.

The other choices do not correspond to the standard multicast address used by STP. Therefore, understanding that the correct answer pertains to the specific multicast address for STP BPDUs helps frame why this is the appropriate choice in the context of STP operations.