What are some possible use cases for PortFast, BPDUGuard, and RootGuard and how would you apply these features/settings in an enterprise environment. You should also focus on why the two (2) Spanning Tree Toolkit features, namely UplinkFast and BackboneFast, are no longer needed when using Ciscos Rapid Per-VLAN Spanning Tree (RPVST/RPVST+) and/or Multiple Spanning Tree (MST). Finally, while PortFast is not recommended for use on trunk ports, can you provide a use case for when you would want to have a trunk port with PortFast enabled Note: Please provide sources