Shortest Path Bridging (SPB) is a network protocol used for Ethernet networks. It is also referred to as IEEE 802.1aq. Some synonyms for Shortest Path Bridging include VLAN-aware bridging, MAC-in-MAC, and Provider Backbone Bridge (PBB). These terms are used to describe the path selection and forwarding method used by SPB. Other related terms include Transparent Interconnection of Lots of Links (TRILL) and FabricPath, which are similar protocols that also use shortest path forwarding. Although these terms have slightly different meanings and methods, they all aim to provide efficient and effective forwarding in large-scale networks. Understanding these synonyms will help network professionals to better understand and implement these protocols in their networks.