Refer to the exhibit. What are the possible port roles for ports A, B, C, and D in this RSTP-enabled network?

Because S1 is the root bridge, B is a designated port, and C and D root ports. RSTP supports a new port type, alternate port in discarding state, that can be port A in this scenario.

Which three components are combined to form a bridge ID?

The three components that are combined to form a bridge ID are bridge priority, extended system ID, and MAC address.

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

Switches learn MAC addresses at the learning and forwarding port states. They receive and process BPDUs at the blocking, listening, learning, and forwarding port states.

If no bridge priority is configured in PVST, which criteria is considered when electing the root bridge?

Which two network design features require Spanning Tree Protocol (STP) to ensure correct network operation? (Choose two.)