If you disable SW3's Fa0/19 and Fa0/22 interfaces, what will be the result?

Disabling interfaces Fa0/19 and Fa0/22 on SW3 will impact the Spanning Tree Protocol (STP) topology. In STP, each switch determines the best path to the root bridge based on port costs. When interfaces are disabled, STP recalculates the topology and assigns new root ports if necessary.

In this scenario, since both Fa0/19 and Fa0/22 are being disabled, SW3 will need to select a new root port from the remaining active interfaces. If Fa0/20 and Fa0/23 are still available, and if Fa0/23 has a lower cost to the root bridge than Fa0/20, then Fa0/23 will be chosen as the new root port.

This means that the new root port for SW3 becomes Fa0/23 after the specified interfaces are disabled, as it would be the next best path with respect to the cost associated in the STP topology. This new selection process is a key aspect of how STP dynamically adjusts to changes in the network, ensuring that there is always a loop-free topology while still maintaining connectivity to the root bridge.