H12-891_V1-0 practice question 27 of 35

In RSTP , which port provides a backup path to reach the root node of the spanning tree? What state is the port in?

Full set: 607 questions

Answer options

A: Root Port and Listening Status

B: Alternate Port and Forwarding Status

C: Alternate Port and Learning Status

D: Designated port and Listening status

E: Alternate port and Discarding status Correct answer

Correct Answer:

E. Alternate port and Discarding status

Explanation

In RSTP, an Alternate port offers a backup (secondary) path toward the root bridge. Alternate ports do not forward frames; they stay in the Discarding state until needed.

Why Incorrect

A. Root ports are primary paths, not backups.
B. Alternate ports never forward while acting as backups.
C. Learning state is for ports about to forward; alternates stay discarding.
D. Designated ports serve downstream segments, not backup root paths.

References

1. Huawei CloudEngine 8800&7800&6800&5800 Configuration Guide – Spanning Tree Protocol, V200R010C00, Sec 4.1 “Port Roles and States”, p.66 (Alternate – Discarding).

2. IEEE Std 802.1D-2004, Clause 17.13 (“Alternate Port: backup path; state DISCARDING”).

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