Which feature helps prevent loops in a network utilizing RSTP?

The feature that helps prevent loops in a network utilizing Rapid Spanning Tree Protocol (RSTP) is PortFast. When enabled, PortFast allows a port to transition directly from a blocking state to the forwarding state without the usual listening and learning states. This is beneficial for ports connected to end devices, like computers or printers, where no loops are involved since there is only a single connection.

By bypassing the waiting time associated with the standard RSTP states, PortFast significantly reduces the time it takes for a device to start communicating on the network after being powered on or rebooted. This helps in maintaining a loop-free topology and ensures quicker connectivity for end-user devices, improving overall network efficiency and performance.