Which two of these statements regarding RSTP are correct? (Choose two.)
A.
RSTP cannot operate with PVST+.
B.
RSTP defines new port roles.
C.
RSTP defines no new port states.
D.
RSTP is a proprietary implementation of IEEE 802.1D STP.
E.
RSTP is compatible with the original IEEE 802.1D STP.
Per-VLAN Spanning Tree (PVST) maintains a spanning tree instance for each VLAN configured in the network.
RSTP is an Enhancement of the Original STP. Port Roles Determine Participation in The Spanning-Tree. Port States is How a Port Processes a Frame.
RSTP works by adding an alternative port and a backup port compared to STP.
RSTP is able to interoperate with legacy STP protocols.
Add new ports but compatible with original
RSTP (Rapid Spanning Tree Protocol)
Spanning Tree Protocol (STP) was originally standardized as IEEE 802.1D, in 802.1d-1998, but much of the functionality (spanning tree, rapid spanning tree, multiple spanning tree) previously specified in 802.1D, 802.1s, 802.1w has been incorporated into IEEE 802.1Q-2014
As the name suggests, it creates a spanning tree within a network of connected layer-2 bridges (typically Ethernet switches), and disables those links that are not part of the spanning tree, leaving a single active path between any two network nodes. STP is based on an algorithm that was invented by Radia Perlman while she was working for Digital Equipment Corporation.