What will happen if you plug a hub into two ports on the same switch configured with PortFast on all the interfaces?

A. You will create a temporary switching loop.
B. You will create a switching loop.
C. Both ports will sense the switch and err-disable.
D. One of the links will disable via spanning tree.

A. You will create a temporary switching loop until the BPDUs are heard from each interface over the hub. However, during this period you will have a switching loop and degrade traffic over the entire switching topology until convergence happens.