CCNA: Cisco Certified Network Associate — Question 953

What is the role of the root port in a switched network?

Answer options

• A. It replaces the designated port when the designated port fails.
• B. It replaces the designated port when the root port fails.
• C. It is the best path to the root from a nonroot switch.
• D. It is administratively disabled until a failover occurs.

Correct answer: C

Explanation

The root port is crucial because it identifies the most efficient route back to the root switch for a nonroot switch. Option A is incorrect because the root port does not replace the designated port; that role is for a backup. Option B is also wrong since the root port does not replace itself in the event of a failure, and option D is misleading as the root port is active under normal conditions.