You have configured a VLAN for an MTU of 9128. However, you have noticed a severe performance decrease from the change. What is the problem?

A. One of the connected switches is still configured for a nominal MTU.
B. The VLAN configuration must still propagate to the other switches.
C. The VTP protocol is not configured correctly.
D. The device does not support jumbo frames.

A. Although the MTU is configured on the VLAN, all switches and devices connected end to end must be configured to support jumbo frames. If you fail to do this, you can expect to see a performance decrease. An MTU of 9128 is defined as a jumbo frame.