What happens when a patch cable is removed from a full-normal patch panel jack?

When a patch cable is removed from a full-normal patch panel jack, the correct answer is that the normal connection between the top and bottom jacks is restored.

In a full-normal patch panel configuration, the top and bottom jacks are connected electrically when no patch cable is inserted. Therefore, removing a patch cable allows the connection to revert to its original state, where the signal can travel directly between the top and bottom jacks without any interruption. This design is useful in many scenarios, such as ensuring that there is always a continuous connection in the network, enabling seamless communication between devices connected to those jacks.

The other options do not accurately describe the behavior of a full-normal patch panel. For example, permanent connection loss would occur in a different configuration, while automatic resetting of the interface typically applies in different contexts, such as powered devices. Signal interruption does happen temporarily when the patch cable is removed but is not a permanent condition as the normal connection gets restored immediately once the cable is removed.