Which three ports are likely to be STP designated ports in a switch configuration with the same default priority?

Which three ports are likely to be STP designated ports in a switch configuration with the same default priority?

• A. fa0/1, fa0/2, fa0/3
• B. fa0/13, fa0/21, fa0/10
• C. fa0/12, fa0/15, fa0/16
• D. fa0/20, fa0/25, fa0/30

Answer: (B)

In the Spanning Tree Protocol (STP), designated ports are those that are selected to forward frames on a network segment. When all switch ports have the same priority, the decision of which ports become designated is typically based on the lowest port number on each switch. In this scenario, considering that the default priority is the same across the ports, the designated ports would be the ones with the lowest numbers. Among the provided choices, fa0/10, fa0/13, and fa0/21 have the lowest numbers, making them the designated ports for that switch configuration. These ports would be prioritized to handle frame forwarding duties within their respective segments, as they have the same priority value. In contrast, other options may have higher numbered ports or combinations that do not reflect the lowest values. Consequently, they would not qualify as designated ports under the rules governing port selection in STP when all else is equal. This fundamental understanding of how STP designates ports is key to effectively managing and troubleshooting network setups using switches.

In the Spanning Tree Protocol (STP), designated ports are those that are selected to forward frames on a network segment. When all switch ports have the same priority, the decision of which ports become designated is typically based on the lowest port number on each switch.

In this scenario, considering that the default priority is the same across the ports, the designated ports would be the ones with the lowest numbers. Among the provided choices, fa0/10, fa0/13, and fa0/21 have the lowest numbers, making them the designated ports for that switch configuration. These ports would be prioritized to handle frame forwarding duties within their respective segments, as they have the same priority value.

In contrast, other options may have higher numbered ports or combinations that do not reflect the lowest values. Consequently, they would not qualify as designated ports under the rules governing port selection in STP when all else is equal. This fundamental understanding of how STP designates ports is key to effectively managing and troubleshooting network setups using switches.