Which two of these statements regarding RSTP are correct? (Choose two.)
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A. B. C. D. E.BD
Rapid Spanning Tree Protocol (RSTP) is an IEEE 802.1w standard protocol that is an improvement over the original Spanning Tree Protocol (STP). RSTP enhances the speed of convergence of the spanning tree and introduces new mechanisms to prevent loops and maintain network stability. Let's analyze the given statements one by one to determine which ones are correct:
A. RSTP defines no new port states.
This statement is incorrect. RSTP defines three port states that are different from those defined by STP. The new port states are discarding, learning, and forwarding. These port states enable RSTP to provide faster convergence and improve network stability.
B. RSTP defines new port roles.
This statement is correct. RSTP introduces new port roles that are different from those defined by STP. The new port roles are root, designated, alternate, and backup. These port roles enable RSTP to provide faster convergence and improve network stability.
C. RSTP cannot operate with PVST+.
This statement is incorrect. RSTP is compatible with PVST+ (Per-VLAN Spanning Tree Plus), which is a Cisco proprietary extension to STP. RSTP can operate with PVST+ to provide faster convergence and improve network stability.
D. RSTP is compatible with the original IEEE 802.1D STP.
This statement is correct. RSTP is backward compatible with the original IEEE 802.1D STP. RSTP can interoperate with STP bridges, and STP bridges can interoperate with RSTP bridges.
E. RSTP is a proprietary implementation of IEEE 802.1D STP.
This statement is incorrect. RSTP is an IEEE 802.1w standard protocol that is an improvement over the original IEEE 802.1D STP. RSTP is not a proprietary implementation of STP.
In summary, the correct statements regarding RSTP are: