Which two of these statements regarding RSTP are correct? (Choose two.)

The correct answer is B. RSTP defines new port roles. E. RSTP is compatible with the original IEEE 802.1D STP. Answer B is correct: RSTP (IEEE 802.1w) introduces two new port roles not found in classic 802.1D - the Alternate port (provides a backup path to the root bridge) and the Backup port (provides a redundant path to the same segment). Answer E is correct: RSTP is fully backward…

Operate a Medium-Sized Switched Network

Question

Which two of these statements regarding RSTP are correct? (Choose two.)

Options

ARSTP cannot operate with PVST+.
BRSTP defines new port roles.
CRSTP defines no new port states.
DRSTP is a proprietary implementation of IEEE 802.1D STP.
ERSTP is compatible with the original IEEE 802.1D STP.

How the community answered

(66 responses)

A
2% (1)
B
89% (59)
C
3% (2)
D
6% (4)

Explanation

Answer B is correct: RSTP (IEEE 802.1w) introduces two new port roles not found in classic 802.1D - the Alternate port (provides a backup path to the root bridge) and the Backup port (provides a redundant path to the same segment). Answer E is correct: RSTP is fully backward compatible with classic IEEE 802.1D STP; RSTP switches can interoperate with legacy STP switches, falling back to classic STP behavior on those links. Answer A is wrong - RSTP can operate with PVST+ (Cisco's Per-VLAN Spanning Tree). Answer C is wrong - RSTP does define new port states (consolidating blocking/listening/disabled into 'discarding'). Answer D is wrong - RSTP is an IEEE standard (802.1w), not a proprietary implementation.

Topics

#RSTP#802.1D compatibility#port roles#PVST+

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