CCNA: Cisco Certified Network Associate — Question 804

What is the root port in STP?

Answer options

• A. It is the port with the highest priority toward the root bridge.
• B. It is the port on the root switch that leads to the designated port on another switch.
• C. It is the port that is elected only when the root bridge has precisely one port on a single LAN segment.
• D. It is the port on a switch with the lowest cost to reach the root bridge.

Correct answer: D

Explanation

The root port is determined by the lowest cost to reach the root bridge, making option D correct. Options A and B describe characteristics of ports but do not define the root port, while option C is incorrect as it pertains to a specific scenario that doesn’t apply in general STP functionality.