Cisco ENCOR Practice Exam 2025 – All-in-One Comprehensive Guide to Mastering Enterprise Network Core Technologies!

The MAC address used for Spanning Tree Protocol (STP) Bridge Protocol Data Units (BPDUs) is indeed 01:80:C2:00:00:00. This address is specifically designated for multicasting BPDUs in the context of STP. When switches communicate using STP, they transmit these BPDUs to all other switches in the network to allow them to manage and maintain the loop-free topology in an Ethernet network.

This specific MAC address is recognized by all devices as the address for STP-related communication. STP utilizes this address to ensure that all switches on the segment can receive the BPDUs while preventing broadcast storms that would occur if a normal MAC address were used.

In contrast, other choices represent different types of addresses: 00:00:00:00:00:00 is a universal address indicating a null or unicast, FF:FF:FF:FF:FF:FF is a broadcast address for all devices on the LAN, and 08:00:27:00:00:00 is a standard unicast MAC address that belongs to a specific device manufacturer. These addresses do not serve the purpose of multicast communication utilized by STP.