单选题What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology？（）Alowest port MAC addressBport priority number and MAC addressCVTP revision numberDhighest port priority numberEpath cost
单选题
What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology？（）
A
lowest port MAC address
B
port priority number and MAC address
C
VTP revision number
D
highest port priority number
E
path cost
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