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单项选择题 Which command will need to be added to External_A to ensure that it will take over if serial 0/0 on  External_B fails? ()

A、 standby 1 priority 130

B、 standby 1 preempt

C、 standby 1 track fastethernet 0/0

D、 standby 1 track 10.10.10.1

  • B
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