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單項(xiàng)選擇題

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


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