- Every two seconds.
- Blocking, Listening, Learning, Forwarding, and Disabled.
- 32768.
- The show spanning-tree vlan x command.
- 19.
- BPDU Guard.
- BPDU Filter.
- The spanning-tree vlan [number] priority [number] and spanning-tree vlan [number] root [primary|secondary] commands.
- True.
- False.