Practice Quiz

Advanced Networking Administrator Test Prep

Category - CCNA

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Which of the following values is used to determine the port that becomes the root port on each non-root switch in a spanning-tree topology?
  1. Lowest port MAC address
  2. Highest port priority number
  3. Port priority number and MAC address
  4. Path cost
Explanation
Answer: D - Path cost is used to determine the port that becomes the root port on each non-root switch in a spanning-tree topology.

Key Takeaway: By default, the root port is a direct link to the root bridge. In other words, it is the shortest path to the root bridge. In case more than one link connects to the root bridge, then a port cost is determined by checking the bandwidth of each link. The lowest cost port becomes the root port.
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