An administrator is auditing a layer 2 enterprise switch topology consisting of four switches configured with IEEE 802.1D Spanning Tree Protocol (STP). The bridge priorities and base MAC addresses for the switches are as follows:
* Switch_Alpha: Priority 32768, MAC 00:0A:B8:11:22:33
* Switch_Beta: Priority 28672, MAC 00:0A:B8:AA:BB:CC
* Switch_Gamma: Priority 28672, MAC 00:0A:B8:77:88:99
* Switch_Delta: Priority 32768, MAC 00:0A:B8:00:11:22
Which switch will be elected as the STP root bridge for this broadcast domain?
- Switch_Gamma, because it has the lowest bridge priority value of 28672 tied with Switch_Beta, and a lower MAC address than Switch_Beta.Cevap
- BSwitch_Delta, because it possesses the lowest numerical MAC address across all switches in the topology.
- CSwitch_Alpha, because higher numerical bridge priority values take precedence in the root bridge election process.
- DSwitch_Beta, because it has the highest MAC address among the switches configured with the lowest priority value.
Cevap
Switch_Gamma will be elected as the root bridge because it shares the lowest bridge priority (28672) and has a lower MAC address than Switch_Beta.
In 802.1D Spanning Tree Protocol, the root bridge is chosen based on the lowest Bridge ID, which consists of a 2-byte Priority and a 6-byte MAC address. Switches with priority 28672 beat switches with priority 32768. Between Switch_Beta and Switch_Gamma (both set to 28672), Switch_Gamma's MAC address (00:0A:B8:77:88:99) is lower than Switch_Beta's MAC address (00:0A:B8:AA:BB:CC), making Switch_Gamma the elected root bridge.
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Spanning Tree Protocol (STP) Root Bridge Election Logic
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