Recently, associates have noticed extremely slow network performance, intermittent connectivity, and connection losses. After entering the "show interfaces" command, you notice that the Ethernet interface is configured as 100 Mbps full-duplex and that there is evidence of late collisions. What could be the cause of this problem?
A. A routing loop
B. Duplex mismatch
C. Trunking mode mismatch
D. Improperly configured root bridge
Answer: B