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Spanning Tree Protocol (part 3) Root Ports In this final sub-lesson on Spanning Tree Protocol, we define and examine what happens with/to Root Ports and their states in the Spanning Tree Protocol process. We explain blocking, listening, learning and forwarding, what happens during each state, what time frames are involved, which have delays and why, which have data transmission and which don't. We'll also examine what happens when there is no destination address for a MAC address, and what impact if any that has on the MAC Address Table.