A junior technician has been making configuration changes on a computer that is connected to a wired network. The computer is now experiencing slow transfer speeds. A senior technician, who is assisting the junior technician, verifies the static IP address, subnet mask, and gateway address on the computer are correct. Other employees on the same network are not experiencing any issues.
Which of the following is the MOST likely problem?
A. Speed and duplex setting of the network card.
B. Crossover cable used instead of straight-through cable
C. MAC filtering enabled on the switch
D. Firewall settings on the computer