A technician recently ran a 20-meter section of CAT6 to relocate a control station to a more central
area on the production floor. Since the relocation, the helpdesk has received complaints about
intermittent operation. During the troubleshooting process, the technician noticed that collisions are
only observed on the switch port during production. Given this information, which of the following is
the cause of the problem?

A.
Distance limitation

B.
Electromagnetic interference

C.
Cross talk

D.
Speed and duplex mismatch