Which of the following are spanning tree port states?（）

A. The BPDU version number
B. The access layer bridge setting
C. The Bridge ID
D. The spanning-tree update number
E. The bridge priority
F. The VLAN number

A. To provide a monitoring mechanism for networks in switched environments.
B. To manage VLANs across multiple switches.
C. To prevent switching loops in networks with redundant switched paths.
D. To segment a network into multiple collision domains.
E. To prevent routing loops in networks.

A. It is the individual link cost based on latency
B. It is the sum of the costs based on bandwidth
C. It is the total hop count
D. It is dynamically determined based on load