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Difficulty: EasyRapid PVST+ Spanning Tree Protocol Operations and Roles

Which two statements accurately describe Rapid PVST+ port roles and operational port states? (Select two.)

  1. An Alternate port maintains a backup path to the root bridge and remains in the Discarding state.Answer
  2. Rapid PVST+ reduces the legacy 802.1D Disabled, Blocking, and Listening states into a single Discarding state.Answer
  3. C
    Base bridge priority values can be configured in custom increments of 1000 for each VLAN instance.
  4. D
    PortFast should be configured on inter-switch trunk links to speed up trunk convergence.

Answer

An Alternate port maintains a backup path to the root bridge and remains in the Discarding state, and Rapid PVST+ reduces the legacy 802.1D Disabled, Blocking, and Listening states into a single Discarding state.
Rapid PVST+ (802.1w) optimizes Spanning Tree by consolidating the 802.1D Disabled, Blocking, and Listening states into a single Discarding state. Under this model, an Alternate port provides a backup path to the root bridge and stays in the Discarding state during normal operation.

Step-by-Step Solution

1
Identify the port states supported by Rapid PVST+ (802.1w).
Rapid PVST+ consolidates legacy 802.1D port states (Disabled, Blocking, Listening) into a single Discarding state.
This reduces operational complexity and improves convergence time.
2
Analyze the function and state of an Alternate port role in Rapid PVST+.
An Alternate port offers an alternate path to the root bridge and remains discarded (not forwarding traffic) unless the primary root port loses connectivity.
Alternate ports provide rapid failover without needing to undergo standard convergence delays.

Key Concept

Rapid PVST+ Port Roles and Port States
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Topics

Rapid PVST+ Spanning Tree Protocol Operations and Roles

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