单选题When testing a CAT5 cable, the technician notices that pin A is open. However, the cable stillworks fine. Which of the following describes how this is possible?（）AThe cable was tested for 100Base-TX.BThe cable is a 1000BaseT cable.CThe switch uses link aggregation,DThe switch was setup to use MDIX
单选题
When testing a CAT5 cable, the technician notices that pin A is open. However, the cable stillworks fine. Which of the following describes how this is possible?（）
A
The cable was tested for 100Base-TX.
B
The cable is a 1000BaseT cable.
C
The switch uses link aggregation,
D
The switch was setup to use MDIX
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