A. learning B. listening C. discarding D. forwarding
Correct Answer: C
PVST+ is based on IEEE802.1D Spanning Tree Protocol (STP). But PVST+ has only 3 port states (discarding, learning and forwarding) while STP has 5 port states (blocking, listening, learning, forwarding and disabled). So discarding is a new port state in PVST+.
A. spanning-tree uplinkfast B. spanning-tree mode rapid-pvst C. spanning-tree backbonefast D. spanning-tree mode mst
Correct Answer: B
Rapid Spanning Tree Protocol (RSTP) is an enhancement of the original STP 802.1D protocol. The RSTP 802.1w protocol is an IEEE open implementation. Cisco has its own proprietary implementation of RSTP, that includes the benefits of its Per-VLAN spanning tree protocols, called Rapid-PVST+.
To activate the Rapid-PVST+ protocol:
switch(config)#spanning-tree mode rapid-pvst