单选题A technician needs to add network capacity. However, when plugging a second switch into the first switch, there is no link light. Which of the following is the cause of this situation?（）AThe switches are not stackableBThe cable was not wired using 568ACThe cable needs to be a crossover cableDThe switches have IGMP snooping enabled
单选题
A technician needs to add network capacity. However, when plugging a second switch into the first switch, there is no link light. Which of the following is the cause of this situation?（）
A
The switches are not stackable
B
The cable was not wired using 568A
C
The cable needs to be a crossover cable
D
The switches have IGMP snooping enabled
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