In which two port states does a switch learn MAC addresses and process BPDUs in a PVST network? (Choose two.)

In a Per-VLAN Spanning Tree (PVST) network, a switch learns MAC addresses and processes Bridge Protocol Data Units (BPDUs) in two port states:

1. Learning State: In this state, the switch learns the MAC addresses of all the devices connected to it. However, it does not forward any frames to these devices. The switch also processes BPDUs to ensure a loop-free topology.

2. Forwarding State: In this state, the switch forwards frames to the devices connected to it. It also continues to learn any new MAC addresses and processes BPDUs.

These two states are part of the Spanning Tree Protocol (STP) which is used to prevent loops in a network.