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spanning-tree关于listening and learning time 如何 adjust and change a mount of time？
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单选题What does the SCN represent？（）A
The system change number， which is a point in time relative to transactions within a given database.B
A number that represents time. Thus， at 1300 hours， the SCN is the same on all databases. C
The security change number， which represents the security code that is needed to access any database structure.D
A conversion factor that converts internal database time to external clock time.E
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单选题How are STP timers and state transitions affected when a topology change occurs in an STP environment？（）A
All ports will temporarily transition to the learning state for a period equal to the max age timer plus the forward delay interval.B
All ports will transition temporarily to the learning state for a period equal to the forward delay interval.C
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