Which of the following is the MOST likely cause?

Several users from the same building are reporting connectivity issues. The SFP at that building’s IDF switch is showing a link light, but there is no link light to the corresponding switch’s SFP at the MDF.

Which of the following is the MOST likely cause?
A . A crossover cable is being used.
B . DB loss is too high on all strands.
C . Only TX or RX strand is working.
D . TX and RX are reversed.

Answer: C

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