RSTP redefines port roles. Please match the port roles of RSTP with its functions.

Question

Options

• ARoot Port: The best interface to the root bridge on the non-root bridge switch; Alternate Port: Another switchable path from the designated bridge to the root port, serving as a backup port for the root port; Backup Port: As a backup for the designated port, it provides another backup path from the root bridge to the corresponding network segment.
• B
• C
• D

• A
  73% (30)
• B
  7% (3)
• C
  15% (6)
• D
  5% (2)

Explanation

Option A is correct because it accurately captures all three RSTP port roles as defined in IEEE 802.1w: the Root Port is the single best-cost path on a non-root switch toward the root bridge, the Alternate Port provides a secondary path to the root bridge and takes over immediately if the Root Port fails, and the Backup Port acts as a redundant connection on the same segment as a Designated Port, stepping in if that Designated Port goes down. Options B, C, and D are blank and contain no definitions, making them automatically incorrect. For a memory aid, think of the roles in terms of what each backs up: the Alternate Port backs up the Root Port (both deal with reaching the root bridge), while the Backup Port backs up the Designated Port (both deal with the local segment); the Root Port itself is always the single forwarding path upstream toward the root.

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