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【多选题】
相对于传统STP,RSTP 定义了两种不同的端口角色,对此说法正确的是A.
如果该端口所连接的网段的指定交换机是此端口所属的交换机，则端口设置为备份端 口
B.
备份端口，处于转发状态，所属交换机为端口所连网段的指定交换机。
C.
预备端口，处于转发状态，所属交换机不是端口所连网段的指定交换机。
D.
无论是备份端口还是预备端口，都不处于转发状态。
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