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For questions about network switches, the term commonly refers to a multi-port network bridge that processes and routes data at the data link layer (layer 2) of the OSI model.

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The MAC address used by the spanning tree algorithm (STA) implemented in a given switch does not belong to any of its Ethernet interfaces. … At least in Cisco implementations, this MAC address is known as base MAC or universal (burned-in) MAC and its purpose is to identify the switch itself, not some of its Ethernet interfaces. …
answered Oct 19 '20 by Humberto Fioravante Ferro