Huawei Certified ICT Associate – Data Center Network (HCIA-DCN) — Question 125

Assuming all STP enabled switches have the same bridge priority. The MAC address of switch A is 00-e0-fc-00-00-40, the MAC address of switch B is 00-e0-fc-00-00-10, the MAC address of switch C is 00-e0-fc-00-00-20, and the MAC address of switch D is 00-e0-fc-00-00-80. Which switch will be elected as the root switch?

Answer options

• A. Switch A
• B. Switch B
• C. Switch C
• D. Switch D

Correct answer: B

Explanation

In Spanning Tree Protocol (STP), the switch with the lowest MAC address is chosen as the root switch when bridge priorities are the same. Since Switch B has the lowest MAC address of 00-e0-fc-00-00-10 compared to the others, it is elected as the root switch. The other switches have higher MAC addresses, making them less preferable as the root.